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1 <?xml version = '1.0' encoding = 'UTF-8'?>
2 <!-- $Header: /home/cvsroot/gentoo/xml/htdocs/doc/en/virt-mail-howto.xml,v 1.29 2004/03/26 12:47:10 cam Exp $ -->
3 <!DOCTYPE guide SYSTEM "/dtd/guide.dtd">
4
5 <guide link=" /doc/en/virt-mail-howto.xml" >
6 <title>Virtual Mailhosting System with Postfix Guide</title>
7 <author title="Author" >
8 <mail link="antifa@gentoo.org" >Ken Nowack</mail>
9 </author>
10 <author title="Author" >
11 <mail link="ezra@revoltltd.org" >Ezra Gorman</mail>
12 </author>
13 <author title="Editor">
14 <mail link="klasikahl@gentoo.org" >Zack Gilburd</mail>
15 </author>
16 <abstract>This document details how to create a virtual mailhosting system based upon postfix, mysql, courier-imap, and cyrus-sasl. </abstract>
17 <version>1.0.10</version>
18 <date>March 4, 2004</date>
19 <!--
20
21 Contents
22
23 I. Introduction
24 II. Postfix Basics
25 III. Courier-imap
26 IV. Cyrus-sasl
27 V. SSL Certificates for Postfix and Apache
28 VI. Adding SSL and SASL support to Postfix
29 VII. MySQL
30 VIII. Apache and phpMyAdmin
31 IX. The vmail user
32 X. Configuring MySQL Authentication and vhosts
33 XI. Squirrelmail
34 XII. Mailman
35 XIII. Content Filtering and Anti-Virus
36 XIV. Wrap Up
37 XV. Troubleshooting
38
39 --><chapter>
40 <title>Introduction</title>
41 <section>
42 <body>
43 <p>For most gentoo users, a simple mail client and fetchmail will do. However, if you're hosting a domain with your system, you'll need a full blown MTA (Mail Transfer Agent). And if you're hosting multiple domains, then you'll definitely need something more robust to handle all of the email for your users. This system was designed to be an elegant solution to that problem.</p>
44 <p>A virtual mail system needs to be able to handle email for numerous domains with multiple users over a variety of interfaces. This presents some issues that must be dealt with. For instance, what if you have two users on different domains that want the same user name? If you are providing imap access and smtp-auth, how do combine the various authentication daemons into a single system? How do you provide security for the numerous components that comprise the system? How do you manage it all?</p>
45 <p>This howto will show you how to set up with a mail system capable of handling mail for as many domains as your hardware can handle, supports virtual mail users that don't require shell accounts, has domain specific user names, can authenticate web, imap, smtp, and pop3 clients against a single database, utilizes ssl for transport layer security, has a web interface, can handle mailing lists for any domain on the machine, and is controlled by a nice, central and easy mysql database. </p>
46 <p>There are quite a variety of ways to go about setting up a virtual mailhosting system. With so may options, another may be the best choice for your specific needs. Consider investigating <uri>http://www.qmail.org/</uri> and <uri>http://www.exim.org/</uri> to explore your options. </p>
47 <p>The following packages are used in this setup:
48
49 apache, courier-imap, pam_mysql, postfix, mod_php, phpmyadmin, squirrelmail, cyrus-sasl, mysql, php, and mailman.</p>
50 <p>Make sure to turn on the following USE variables in <path>/etc/make.conf</path> before compiling the packages: <c>USE=&quot;mysql imap libwww maildir sasl ssl&quot;</c>. Otherwise you will most likely have to recompile things to get the support you need for all the protocols. Further, it's a good idea to turn off any other mail and network variables, like ipv6.</p>
51 <impo>This howto was written for postfix-2.0.x. If you are using postfix &lt; 2 some of the variables in this document will be different. It is recommended that you upgrade. Some other packages included in this howto are version sensitive as well. You are advised to read the documentation included with packages if you run into issues with this.</impo>
52 <impo>This document uses apache-1.3.x. Apache-2 has been marked stable in portage. However there are still a number of issues with php integration. Until php support in apache-2.0.x is marked stable, this guide will continue to use the 1.3.x version.</impo>
53 <impo>You need a domain name to run a public mail server, or at least an MX record for a domain. Ideally you would have control of at least two domains to take advantage of your new virtual domain functionality.</impo>
54 <impo>Make sure <path>/etc/hostname</path> is set to the right hostname for your mail server. Verify your hostname is set correctly with <c>hostname</c>. Also verify that there are no conflicting entries in <path>/etc/hosts</path>.</impo>
55 <note>It is recommended that you read this entire document and familiarize yourself with all the steps before attempting the install. If you run into problems with any of the steps, check the troubleshooting guide at the end of this document. Also, not all the referenced packages are necessary, this set up is very flexible. For instance, if you do not desire a web interface, feel free to skip the squirrelmail section.</note>
56 </body>
57 </section>
58 </chapter>
59
60 <chapter>
61 <title>Postfix Basics</title>
62 <section>
63 <body>
64 <pre caption="Install postfix" ># <i>emerge postfix</i>
65 </pre>
66 <warn>Verify that you have not installed any other MTA, such as ssmtp, exim, or qmail, or you will surely have BIG problems.</warn>
67 <p>After postfix is installed, it's time to configure it. Change the following options in <path>/etc/postfix/main.cf</path>:</p>
68 <pre caption="/etc/postfix/main.cf" >
69 myhostname = $host.domain.name
70 mydomain = $domain.name
71 inet_interfaces = all
72 mydestination = $myhostname, localhost.$mydomain $mydomain
73 mynetworks = my.ip.net.work/24, 127.0.0.0/8
74 home_mailbox = .maildir/
75 local_destination_concurrency_limit = 2
76 default_destination_concurrency_limit = 10 </pre>
77 <p>Next change the following in <path>/etc/postfix/master.cf</path>. This will turn on verbose output for debugging:</p>
78 <pre caption="/etc/postfix/master.cf" >
79 # service type private unpriv chroot wakeup maxproc command + args
80 # (yes) (yes) (yes) (never) (50)
81 #
82 ==========================================================================
83 smtp inet n - n - - smtpd -v
84
85 <codenote>Just add the "-v" after the smtpd in the above line</codenote>
86 </pre>
87 <p>Next, edit <path>/etc/mail/aliases</path> to add your local aliases. There should at least be an alias for root like: <c>root: your@email.address</c>.</p>
88 <pre caption="Starting postfix for the first time" >
89 # <i>/usr/bin/newaliases</i>
90 <codenote>This will install the new aliases. You only need to do this </codenote>
91 <codenote>when you update or install aliases.</codenote>
92
93 # <i>/etc/init.d/postfix start</i>
94 </pre>
95 <p>Now that postfix is running, fire up your favorite console mail client and send yourself an email. I use <c>mutt</c> for all my console mail. Verify that postfix is delivering mail to local users, once that's done, we're on to the next step.</p>
96 <note>I strongly recommend that you verify this basic postfix setup is functioning before you progress to the next step of the howto. </note>
97 </body>
98 </section>
99 </chapter>
100 <chapter>
101 <title>Courier-imap</title>
102 <section>
103 <body>
104 <pre caption="Install courier-imap" ># <i>emerge courier-imap</i>
105 </pre>
106 <pre caption="Courier-imap configuration" >
107 # <i>cd /etc/courier-imap</i>
108 <codenote>If you want to use the ssl capabilities of courier-imap or pop3, </codenote>
109 <codenote>you'll need to create certs for this purpose.</codenote>
110 <codenote>This step is recommended. If you do not want to use ssl, skip this step.</codenote>
111
112 # <i>nano -w pop3d.cnf</i>
113 # <i>nano -w imapd.cnf</i>
114 <codenote>Change the C, ST, L, CN, and email parameters to match your server.</codenote>
115
116 # <i>mkpop3dcert</i>
117 # <i>mkimapdcert</i>
118 </pre>
119 <pre caption="Start the courier services you need." >
120 # <i>/etc/init.d/courier-imapd start</i>
121 # <i>/etc/init.d/courier-imapd-ssl start</i>
122 # <i>/etc/init.d/courier-pop3d start</i>
123 # <i>/etc/init.d/courier-pop3d-ssl start</i>
124 </pre>
125 <p>Start up your favorite mail client and verify that all connections you've started work for receiving and sending mail. Now that the basics work, we're going to do a whole bunch of stuff at once to get the rest of the system running. Again, please verify that what we've installed already works before progressing.</p>
126 </body>
127 </section>
128 </chapter>
129 <chapter>
130 <title>Cyrus-sasl</title>
131 <section>
132 <body>
133 <p>Next we're going to install cyrus-sasl. Sasl is going to play the role of actually passing your auth variables to pam, which will in turn pass that information to mysql for authentication of smtp users. For this howto, we'll not even try to verify that sasl is working until mysql is set up and contains a test user. Which is fine since we'll be authenticating against mysql in the end anyway.</p>
134 <note>Now for some reason, sasl will not play nicely with pam against the shadow file. I banged my head against this problem for, well, a long time. If anyone knows why sasl will not auth against the shadow file in its current gentoo incarnation, please <mail link="ken@kickasskungfu.com" >email me</mail> as I'd love to hear a solution to this.</note>
135 <pre caption="Configuring and installing the cyrus-sasl ebuild" >
136 # <i>USE='-ldap -mysql' emerge cyrus-sasl</i>
137 <codenote>We don't have ldap and we're not using sasl's mysql capabilities </codenote>
138 <codenote>so we need to turn them off for this build.</codenote>
139 </pre>
140 <p>Next, edit <path>/etc/sasl2/smtpd.conf</path>.</p>
141 <pre caption="Starting sasl" >
142 # <i>nano -w /etc/sasl2/smtpd.conf</i>
143 pwcheck_method: saslauthd
144 mech_list: LOGIN PLAIN
145 <codenote>It's important to turn off auth methods we are not using.</codenote>
146 <codenote>They cause problems for some mail clients.</codenote>
147 # <i>/etc/init.d/saslauthd start</i>
148 </pre>
149 </body>
150 </section>
151 </chapter>
152 <chapter>
153 <title>SSL Certs for Postfix and Apache</title>
154 <section>
155 <body>
156 <p>Next we're going to make a set of ssl certificates for postfix and apache.</p>
157 <pre>
158 # <i>cd /etc/ssl/</i>
159 # <i>nano -w openssl.cnf</i>
160
161 <codenote>Change the following default values for your domain:</codenote>
162 countryName_default
163 stateOrProvinceName_default
164 localityName_default
165 0.organizationName_default
166 commonName_default
167 emailAddress_default.
168
169 <codenote>If the variables are not already present, just add them in a sensible place.</codenote>
170
171
172 # <i>cd misc</i>
173 # <i>nano -w CA.pl</i>
174 <codenote>We need to add -nodes to the # create a certificate and</codenote>
175 <codenote>#create a certificate request code in order to let our new ssl</codenote>
176 <codenote>certs be loaded without a password. Otherwise when you</codenote>
177 <codenote>reboot your ssl certs will not be available.</codenote>
178
179 # create a certificate
180 system (&quot;$REQ -new -nodes -x509 -keyout newreq.pem -out newreq.pem $DAYS&quot;);
181
182 # create a certificate request
183 system (&quot;$REQ -new -nodes -keyout newreq.pem -out newreq.pem $DAYS&quot;);
184
185 # <i>./CA.pl -newca</i>
186 # <i>./CA.pl -newreq</i>
187 # <i>./CA.pl -sign</i>
188 # <i>cp newcert.pem /etc/postfix</i>
189 # <i>cp newreq.pem /etc/postfix</i>
190 # <i>cp demoCA/cacert.pem /etc/postfix</i>
191 <codenote>Now we do the same thing for apache</codenote>
192
193 # <i>openssl req -new > new.cert.csr</i>
194 # <i>openssl rsa -in privkey.pem -out new.cert.key</i>
195 # <i>openssl x509 -in new.cert.csr -out new.cert.cert -req -signkey new.cert.key -days 365</i>
196 <codenote>Just leave the resulting certificates here for now.</codenote>
197 <codenote>We'll install them after Apache is installed.</codenote>
198 </pre>
199 </body>
200 </section>
201 </chapter>
202 <chapter>
203 <title>Adding SSL and SASL support to Postfix</title>
204 <section>
205 <body>
206 <p>Now edit the postfix config's to make it aware of your new sasl and ssl capabilities. Add the following parameters to the end of the file where they will be easy to find.</p>
207 <pre caption="/etc/postfix/main.cf" >
208 # <i>nano -w /etc/postfix/main.cf</i>
209
210 smtpd_sasl_auth_enable = yes
211 smtpd_sasl2_auth_enable = yes
212 smtpd_sasl_security_options = noanonymous
213 broken_sasl_auth_clients = yes
214 smtpd_sasl_local_domain =
215
216 <codenote>The broken_sasl_auth_clients option and the login auth method </codenote>
217 <codenote>are for outlook and outlook express only and are undocumented.</codenote>
218 <codenote>Isn't having to hack software for stupid, broken, M$ BS great?</codenote>
219 <codenote>smtpd_sasl_local_domain appends a domain name to clients using</codenote>
220 <codenote>smtp-auth. Make sure it's blank or your user names will get</codenote>
221 <codenote>mangled by postfix and be unable to auth.</codenote>
222
223 smtpd_recipient_restrictions =
224 permit_sasl_authenticated,
225 permit_mynetworks,
226 reject_unauth_destination
227
228
229 smtpd_use_tls = yes
230 #smtpd_tls_auth_only = yes
231 smtpd_tls_key_file = /etc/postfix/newreq.pem
232 smtpd_tls_cert_file = /etc/postfix/newcert.pem
233 smtpd_tls_CAfile = /etc/postfix/cacert.pem
234 smtpd_tls_loglevel = 3
235 smtpd_tls_received_header = yes
236 smtpd_tls_session_cache_timeout = 3600s
237 tls_random_source = dev:/dev/urandom
238
239 <codenote>smtpd_tls_auth_only is commented out to ease testing the system. </codenote>
240 <codenote>You can turn this on later if you desire.</codenote>
241
242 # <i>postfix reload</i>
243 </pre>
244 <p>Now we're going to verify that the config's we added were picked up by postfix.</p>
245 <pre caption="Verifying sasl and tls support" >
246 # <i>telnet localhost 25</i>
247
248 Trying 127.0.0.1...
249 Connected to localhost.
250 Escape character is '^]'.
251 220 mail.domain.com ESMTP Postfix
252 <i>EHLO domain.com</i>
253 250-mail.domain.com
254 250-PIPELINING
255 250-SIZE 10240000
256 250-VRFY
257 250-ETRN
258 250-STARTTLS
259 250-AUTH LOGIN PLAIN
260 250-AUTH=LOGIN PLAIN
261 250-XVERP
262 250 8BITMIME
263 <i>^]</i>
264 telnet> <i>quit</i>
265 </pre>
266 <p>Verify that the above AUTH and STARTTLS lines now appear in your postfix install. As I said before, as it stands now AUTH will not work. that's because sasl will try to auth against it's sasldb, instead of the shadow file for some unknown reason, which we have not set up. So we're going to just plow through and set up mysql to hold all of our auth and virtual domain information.
267 </p>
268 </body>
269 </section>
270 </chapter>
271 <chapter>
272 <title>MySQL</title>
273 <section>
274 <body>
275 <p>Next we're going to install and configure MySQL. You'll need the <uri link="http://kickasskungfu.com/~ken/genericmailsql.sql" >genericmailsql.sql</uri> dumpfile for this step.</p>
276 <pre caption="Installing and configuring MySQL" >
277 # <i>emerge mysql</i>
278
279 # <i>/usr/bin/mysql_install_db</i>
280 <codenote>After this command runs follow the onscreen directions</codenote>
281 <codenote>for adding a root password with mysql,</codenote>
282 <codenote>not mysqladmin, otherwise your db will be wide open.</codenote>
283
284 # <i>/etc/init.d/mysql start</i>
285 # <i>mysqladmin -u root -p create mailsql</i>
286 # <i>mysql -u root -p mailsql &lt; genericmailsql.sql</i>
287
288 # <i>mysql -u root -p mysql</i>
289 mysql> <i>GRANT SELECT,INSERT,UPDATE,DELETE</i>
290 -> <i>ON mailsql.*</i>
291 -> <i>TO mailsql@localhost</i>
292 -> <i>IDENTIFIED BY '$password';</i>
293
294 -> <i>quit</i>
295 <codenote>Verify that the new mailsql user can connect to the mysql server.</codenote>
296
297 # <i>mysql -u mailsql -p mailsql</i>
298 </pre>
299
300 <p>
301 Your new database has default values and tables set up for two domains. The following tables are included:
302 </p>
303
304 <ul>
305 <li>alias - local email alias and mailman alias information.</li>
306 <li>relocated - relocated user email address maps</li>
307 <li>transport - default mail transport information for all domains you are hosting</li>
308 <li>users - all user account information</li>
309 <li>virtual - virtual domain email alias maps</li>
310 </ul>
311
312 <pre caption="alias table sample" >
313 id alias destination
314 1 root foo@bar.com
315 2 postmaster foo@bar.com
316 </pre>
317 <pre caption="user table sample" >
318 <codenote>Line wrapped for clarity</codenote>
319 id email clear name uid gid homedir \
320 maildir quota postfix
321 10 foo@virt-bar.org $password realname virtid virtid /home/vmail \
322 /home/vmail/virt-bar.org/foo/.maildir/ y
323 13 foo@bar.com $password realname localid localid /home/foo \
324 /home/foo/.maildir/ y
325 </pre>
326 <pre caption="transport table sample" >
327 id domain destination
328 1 bar.com local:
329 2 virt-bar.org virtual:
330 </pre>
331 <pre caption="virtual table sample" >
332 id email destination
333 3 root@virt-bar.org other@email.address
334 </pre>
335 </body>
336 </section>
337 </chapter>
338 <chapter>
339 <title>Apache and phpMyAdmin</title>
340 <section>
341 <body>
342 <p>Next we'll set up apache and add an interface to interact with the database more easily. </p>
343 <pre caption="Setting up apache and phpmyadmin" >
344 # <i>emerge apache mod_php phpmyadmin</i>
345 </pre>
346 <p>There are plenty of guides out there about how to set up apache with php. Like this one: <uri>http://www.linuxguruz.org/z.php?id=31</uri>. There are also numerous posts on <uri>http://forums.gentoo.org</uri> detailing how to solve problems with the installation (search for 'apache php'). So, that said, I'm not going to cover it here. Set up the apache and php installs, then continue with this howto. Now, a word for the wise: .htaccess the directory that you put phpmyadmin in. If you do not do this, search engine spiders will come along and index the page which in turn will mean that anyone will be able to find your phpmyadmin page via google and in turn be able to come change your database however they want which is <e>BAD!</e> There are many howtos on this including: <uri>http://www.csoft.net/docs/micro/htaccess.html.en</uri>.</p>
347
348 <p>
349 Now we're going to install the Apache certificates we made previously. The Apache-SSL directives that you need to use the resulting cert are:
350 </p>
351
352 <ul>
353 <li>SSLCertificateFile /path/to/certs/new.cert.cert</li>
354 <li>SSLCertificateKeyFile /path/to/certs/new.cert.key</li>
355 </ul>
356
357 <pre caption="Install Apache SSL certificates" >
358 # <i>cp /etc/ssl/misc/new.cert.cert /etc/apache/conf/ssl/</i>
359 # <i>cp /etc/ssl/misc/new.cert.key /etc/apache/conf/ssl/</i>
360 # <i>nano -w /etc/apache/conf/vhosts/ssl.default-vhost.conf</i>
361 <codenote>Change the following parameters</codenote>
362
363 ServerName host.domain.name
364 ServerAdmin your@email.address
365 SSLCertificateFile /etc/apache/conf/ssl/new.cert.cert
366 SSLCertificateKeyFile /etc/apache/conf/ssl/new.cert.key
367
368 # <i>/etc/init.d/apache restart</i>
369 </pre>
370 <note>If you have an existing apache install, you'll likely have to perform a full server reboot to install your new certificates. Check your logs to verify apache restarted successfully.</note>
371 <p>Next, configure phpMyAdmin.</p>
372 <pre caption="Configuring phpMyAdmin" >
373 # <i>nano -w /var/www/localhost/htdocs/phpmyadmin/config.inc.php</i>
374 <codenote>Change the following parameters</codenote>
375
376 $cfg['Servers'][$i]['host'] = 'localhost'; // MySQL hostname
377 $cfg['Servers'][$i]['controluser'] = 'mailsql'; // MySQL control user settings
378 // (this user must have read-only
379 $cfg['Servers'][$i]['controlpass'] = '$password'; // access to the &quot;mysql/user&quot;
380 // and &quot;mysql/db&quot; tables)
381 $cfg['Servers'][$i]['user'] = 'mailsql'; // MySQL user
382 $cfg['Servers'][$i]['password'] = '$password'; // MySQL password
383 </pre>
384 <p>Now enter the phpmyadmin page and browse the tables. You'll want to add in your local aliases, edit your user table to add a test user, and change your transport table to add information about your domains. The default values supplied with the dumpfile should be a sufficient guide to what values need to go where. Make sure that if you put information in the database that it is accurate. For instance, make sure the local users home dir exists and that the correct uid/gid values are in place. The maildirs should be created automatically by postfix when the user receives their first email. So, in general, it's a good idea to send a &quot;Welcome&quot; mail to a new user after you setup their account to make sure the .maildir gets created. </p>
385 </body>
386 </section>
387 </chapter>
388 <chapter>
389 <title>The vmail user</title>
390 <section>
391 <body>
392 <p>At this point you may be wondering what user and directory to use for virtual mail users, and rightly so. Let's set that up.</p>
393 <pre caption="Adding the vmail user" >
394 # <i>adduser -d /home/vmail -s /bin/false vmail</i>
395 # <i>uid=`cat /etc/passwd | grep vmail | cut -f 3 -d :`</i>
396 # <i>groupadd -g $uid vmail</i>
397 # <i>mkdir /home/vmail</i>
398 # <i>chown vmail: /home/vmail</i>
399 </pre>
400 <p>So now when you're setting up vmail accounts, use the vmail uid, gid, and homedir. When you're setting up local accounts, use that users uid, gid, and homedir. We've been meaning to create a php admin page for this setup but haven't gotten around to it yet, as phpmyadmin generally works fine for us.</p>
401 </body>
402 </section>
403 </chapter>
404 <chapter>
405 <title>Configuring MySQL Authentication and vhosts</title>
406 <section>
407 <body>
408 <p>Next we'll reconfigure our authentication to use the mailsql database in courier-imap and postfix. In all of the following examples, replace $password with the password you set for the mailsql mysql user.</p>
409 <pre>
410 # <i>emerge pam_mysql</i>
411 # <i>nano -w /etc/pam.d/imap</i>
412 <codenote>Comment out the existing auth lines and add the following as shown.</codenote>
413
414 #auth required pam_nologin.so
415 #auth required pam_stack.so service=system-auth
416 #account required pam_stack.so service=system-auth
417 #session required pam_stack.so service=system-auth
418
419 auth optional pam_mysql.so host=localhost db=mailsql user=mailsql \
420 passwd=$password table=users usercolumn=email passwdcolumn=clear crypt=0
421 account required pam_mysql.so host=localhost db=mailsql user=mailsql \
422 passwd=$password table=users usercolumn=email passwdcolumn=clear crypt=0
423
424 # <i>nano -w /etc/pam.d/pop3</i>
425 # <i>nano -w /etc/pam.d/smtp</i>
426 <codenote>Make the same changes to the pop3 and smtp files</codenote>
427 </pre>
428 <p>Next, we need to edit courier's authentication config's.</p>
429 <pre>
430 # <i>nano -w /etc/courier-imap/authdaemonrc</i>
431 authmodulelist=&quot;authmysql authpam&quot;
432
433 # <i>nano -w /etc/courier-imap/authdaemond.conf</i>
434 AUTHDAEMOND=&quot;authdaemond.mysql&quot;
435
436 # <i>nano -w /etc/courier-imap/authmysqlrc</i>
437 MYSQL_SERVER localhost
438 MYSQL_USERNAME mailsql
439 MYSQL_PASSWORD $password
440 MYSQL_DATABASE mailsql
441 MYSQL_USER_TABLE users
442 #MYSQL_CRYPT_PWFIELD crypt (make sure this is commented out since we're storing plaintext)
443 MYSQL_CLEAR_PWFIELD clear
444 MYSQL_UID_FIELD uid
445 MYSQL_GID_FIELD gid
446 MYSQL_LOGIN_FIELD email
447 MYSQL_HOME_FIELD homedir
448 MYSQL_NAME_FIELD name
449 MYSQL_MAILDIR_FIELD maildir
450
451 # <i>/etc/init.d/authdaemond restart</i>
452 # <i>/etc/init.d/saslauthd restart</i>
453 </pre>
454 <p>We're almost there I promise! Next, set up the rest of the necessary config's for postfix to interract with the database for all it's other transport needs.</p>
455 <pre caption="/etc/postfix/mysql-aliases.cf" >
456 # <i>nano -w /etc/postfix/mysql-aliases.cf</i>
457 # mysql-aliases.cf
458
459 user = mailsql
460 password = $password
461 dbname = mailsql
462 table = alias
463 select_field = destination
464 where_field = alias
465 hosts = unix:/var/run/mysqld/mysqld.sock
466 </pre>
467 <pre caption="/etc/postfix/mysql-relocated.cf" >
468 # <i>nano -w /etc/postfix/mysql-relocated.cf</i>
469 # mysql-relocated.cf
470
471 user = mailsql
472 password = $password
473 dbname = mailsql
474 table = relocated
475 select_field = destination
476 where_field = email
477 hosts = unix:/var/run/mysqld/mysqld.sock
478 </pre>
479 <pre caption="/etc/postfix/mysql-transport.cf (optional)" >
480 # <i>nano -w /etc/postfix/mysql-transport.cf</i>
481 # mysql-transport.cf
482
483 user = mailsql
484 password = $password
485 dbname = mailsql
486 table = transport
487 select_field = destination
488 where_field = domain
489 hosts = unix:/var/run/mysqld/mysqld.sock
490 </pre>
491 <pre caption="/etc/postfix/mysql-virtual-gid.cf (optional)" >
492 # <i>nano -w /etc/postfix/mysql-virtual-gid.cf</i>
493 #myql-virtual-gid.cf
494
495 user = mailsql
496 password = $password
497 dbname = mailsql
498 table = users
499 select_field = gid
500 where_field = email
501 additional_conditions = and postfix = 'y'
502 hosts = unix:/var/run/mysqld/mysqld.sock
503 </pre>
504 <pre caption="/etc/postfix/mysql-virtual-maps.cf" >
505 # <i>nano -w /etc/postfix/mysql-virtual-maps.cf</i>
506 #myql-virtual-maps.cf
507
508 user = mailsql
509 password = $password
510 dbname = mailsql
511 table = users
512 select_field = maildir
513 where_field = email
514 additional_conditions = and postfix = 'y'
515 hosts = unix:/var/run/mysqld/mysqld.sock
516 </pre>
517 <pre caption="/etc/postfix/mysql-virtual-uid.cf (optional)" >
518 # <i>nano -w /etc/postfix/mysql-virtual-uid.cf</i>
519 # mysql-virtual-uid.cf
520
521 user = mailsql
522 password = $password
523 dbname = mailsql
524 table = users
525 select_field = uid
526 where_field = email
527 additional_conditions = and postfix = 'y'
528 hosts = unix:/var/run/mysqld/mysqld.sock
529 </pre>
530 <pre caption="/etc/postfix/mysql-virtual.cf" >
531 # <i>nano -w /etc/postfix/mysql-virtual.cf</i>
532 # mysql-virtual.cf
533
534 user = mailsql
535 password = $password
536 dbname = mailsql
537 table = virtual
538 select_field = destination
539 where_field = email
540 hosts = unix:/var/run/mysqld/mysqld.sock
541 </pre>
542 <p>Lastly, edit <path>/etc/postfix/main.cf</path> one more time.</p>
543 <pre caption="/etc/postfix/main.cf" >
544 # <i>nano -w /etc/postfix/main.cf</i>
545 alias_maps = mysql:/etc/postfix/mysql-aliases.cf
546 relocated_maps = mysql:/etc/postfix/mysql-relocated.cf
547
548 local_transport = local
549 local_recipient_maps = $alias_maps $virtual_mailbox_maps unix:passwd.byname
550
551 virtual_transport = virtual
552 virtual_mailbox_domains =
553 virt-bar.com,
554 $other-virtual-domain.com
555
556 virtual_minimum_uid = 1000
557 virtual_gid_maps = static:$vmail-gid
558 virtual_mailbox_maps = mysql:/etc/postfix/mysql-virtual-maps.cf
559 virtual_alias_maps = mysql:/etc/postfix/mysql-virtual.cf
560 virtual_uid_maps = static:$vmail-uid
561 virtual_mailbox_base = /
562 #virtual_mailbox_limit =
563 </pre>
564
565 <p>
566 For security reasons you should change the permissions of the various
567 <path>/etc/mail/mysql-*.cf</path>:
568 </p>
569
570 <pre caption="Changing file permission">
571 # <i>chmod 640 /etc/postfix/mysql-*.cf</i>
572 # <i>chgrp postfix /etc/postfix/mysql-*.cf</i>
573 </pre>
574
575 <p>As of Postfix 2.0.x, there were a number of significant changes over the 1.1.x release. Notably the transport, virtual-gid, and virtual-uid tables are no longer necessary. The tables are still included if you wish to use them.</p>
576 <note>It is recommended tha you read VIRTUAL_README included with the postfix doc's for more information.</note>
577 <pre># <i>postfix reload</i>
578 </pre>
579 <p>Now, if all went well, you should have a functioning mailhost. Users should be able to authenticate against the sql database, using their full email address, for pop3, imap, and smtp. I would highly suggest that you verify that everything is working at this point. If you run into problems (with as many things as this setup has going on, it's likely that you will) check the troubleshooting section of this howto.</p>
580 </body>
581 </section>
582 </chapter>
583 <chapter>
584 <title>Squirrelmail</title>
585 <section>
586 <body>
587 <pre>
588 # <i>emerge squirrelmail</i>
589 <codenote>I like to add a link to the htdocs space for a shorter url.</codenote>
590
591 # <i>ln -s /var/www/localhost/htdocs/squirrelmail/ /var/www/localhost/htdocs/mail</i>
592 # <i>cd /var/www/localhost/htdocs/mail/conf</i>
593 # <i>./conf.pl</i>
594 <codenote>Change your Organization, Server, and Folder settings for squirrelmail.</codenote>
595 <codenote>Now you should be able to login to squirrelmail, again - with your full email address,</codenote>
596 <codenote>and use your new webmail setup.</codenote>
597 </pre>
598 </body>
599 </section>
600 </chapter>
601 <chapter>
602 <title>Mailman</title>
603 <section>
604 <body>
605 <p>Last step: mailman. The new version of mailman has very nice virtual domain support, which is why I use it, not to mention it's really a great package. To get this package installed and working correctly for virtual domains is going to require a bit of hacking. I really recommend reading all of the mailman documentation, including README.POSTFIX.gz, to understand what's being done here.</p>
606 <p>One further note, current versions of mailman install to /usr/local/mailman. If you're like me and wish to change the default install location, it can be overridden in the ebuild filoe by changing the INSTALLDIR variable.</p>
607 <pre caption="/usr/portage/net-mail/mailman/mailman-$ver.ebuild">
608 # <i>nano -w /usr/portage/net-mail/mailman/mailman-$ver.ebuild</i>
609 MAILGID="280"
610 <codenote>Set MAILGID to the mailman group instead of nobody</codenote>
611 <codenote>This is needed for postfix integration</codenote>
612 </pre>
613 <pre>
614 # <i>emerge mailman</i>
615 <codenote>This package is currently masked as well, so you'll need to unmask it or give </codenote>
616 <codenote>emerge an explicit path to the ebuild. Once it's installed, follow the directions</codenote>
617 <codenote>in the README.gentoo.gz *except* do not add your aliases to /etc/mail/aliases.</codenote>
618 <codenote>We will instead be linking the entire alias db into postfix.</codenote>
619
620 # <i>zless /usr/share/doc/mailman-$ver/README.gentoo.gz</i>
621 </pre>
622 <pre caption="Setting defaults: Mailman/Defaults.py">
623 # <i> nano -w /var/mailman/Mailman/Defaults.py</i>
624 <codenote>Change the values below to reflect your primary domain, virtuals will be set next.</codenote>
625 DEFAULT_EMAIL_HOST = 'domain.com'
626 DEFAULT_URL_HOST = 'www.domain.com'
627 </pre>
628 <pre caption="mailman config: mm_cfg.py">
629 # <i>nano -w /var/mailman/Mailman/mm_cfg.py</i>
630 MTA = "Postfix"
631 POSTFIX_STYLE_VIRTUAL_DOMAINS = ['virt-domain.com', 'virt.domain2.com']
632 add_virtualhost('www.virt.domain.com', 'virt.domain.com')
633 add_virtualhost('www.virt.domain2.com', 'virt.domain2.com')
634 <codenote>This is required for your virtual domains for mailman to function.</codenote>
635 </pre>
636 <pre>
637 <codenote>Once that's finished, add your first list.</codenote>
638
639 # <i>su mailman</i>
640 # <i>cd ~</i>
641 # <i>bin/newlist test</i>
642 Enter the email of the person running the list: your@email.address
643 Initial test password:
644 Hit enter to continue with test owner notification...
645 <codenote>Virtual domain lists may be specified with</codenote>
646 <codenote>list@domain.com style list names</codenote>
647 # <i>bin/genaliases</i>
648 <codenote>Now that your aliases have been generated,</codenote>
649 <codenote>verify that they were added successfully.</codenote>
650
651 # <i>nano -w data/aliases</i>
652 # STANZA START: test
653 # CREATED:
654 test: "|/var/mailman/mail/mailman post test"
655 test-admin: "|/var/mailman/mail/mailman admin test"
656 test-bounces: "|/var/mailman/mail/mailman bounces test"
657 test-confirm: "|/var/mailman/mail/mailman confirm test"
658 test-join: "|/var/mailman/mail/mailman join test"
659 test-leave: "|/var/mailman/mail/mailman leave test"
660 test-owner: "|/var/mailman/mail/mailman owner test"
661 test-request: "|/var/mailman/mail/mailman request test"
662 test-subscribe: "|/var/mailman/mail/mailman subscribe test"
663 test-unsubscribe: "|/var/mailman/mail/mailman unsubscribe test"
664 # STANZA END: test
665
666 # <i>/etc/init.d/mailman start</i>
667 # <i>rc-update add mailman default</i>
668 <codenote>To start mailman at once and on every reboot</codenote>
669 </pre>
670
671 <pre caption="Adding mailman alias support to postfix">
672 # <i>nano -w /etc/postfix/main.cf</i>
673 owner_request_special = no
674 recipient_delimiter = +
675 <codenote>Read README.POSTFIX.gz for details on this</codenote>
676
677 alias_maps =
678 hash:/var/mailman/data/aliases,
679 mysql:/etc/postfix/mysql-aliases.cf
680
681 virtual_alias_maps =
682 hash:/var/mailman/data/virtual-mailman,
683 mysql:/etc/postfix/mysql-virtual.cf
684 <codenote>This adds mailman alias file support to postfix</codenote>
685 <codenote>You may of course use the mysql tables for this,</codenote>
686 <codenote>but I hate doing that by hand. Also, if you are not</codenote>
687 <codenote>using virtual domains, adding the virtual alias maps</codenote>
688 <codenote>to postfix may cause problems, be warned.</codenote>
689 </pre>
690 <p> You should now be able to setup mailing lists for any domain on your box. Last note on this, make sure you run all mailman commands as the user mailman (<c>su mailman</c>) or else the permissions will be wrong and you'll have to fix them. Read the mailman doc's for more information on setting up and managing mailman lists.</p>
691 </body>
692 </section>
693 </chapter>
694 <chapter>
695 <title>Content Filtering and Anti-Virus</title>
696 <section>
697 <body><p>Coming soon...it would be done already but I need some perl help and testing to make it so. If you'd like to volunteer for that, please email me.</p></body>
698 </section>
699 </chapter>
700 <chapter>
701 <title>Wrap Up</title>
702 <section>
703 <body>
704 <p>Ok, you're all set, edit <path>/etc/postfix/master.cf</path> and turn off verbose mode for production use. You'll probably also want to add the services to your startup routine to make sure everything comes back up on a reboot. Make sure to add all the services you're using - apache, mysql, saslauthd, postfix, courier-imapd, courier-imapd-ssl, courier-pop3d, and courier-pop3d-ssl are all up to your decision on what access you want to provide. I generally have all the services enabled.</p>
705 <pre caption="Wrap up" >
706 # <i>postfix reload</i>
707 # <i>rc-update add $service default</i>
708 </pre>
709 <p>
710 <e>Have fun!</e>
711 </p>
712 </body>
713 </section>
714 </chapter>
715 <chapter>
716 <title>Troubleshooting</title>
717 <section>
718 <title>Introduction</title>
719 <body>
720 <p>Troubleshooting: This is a short troubleshooting guide for the set up we've detailed how to install here. It is not exhaustive, but meant as a place to get you started in figuring out problems. With a complicated setup such as this, it's imperative that you narrow down the problem to the particular component that is malfunctioning. In general I do that by following a few steps. Start from the base of the system and work your way up, ruling out components that work along the way until you discover which component is having the problem.</p>
721 </body>
722 </section>
723 <section>
724 <title>Step 1: Check your config files.</title>
725 <body>
726 <p>Typos are killers, especially when dealing with authentication systems. Scan your config's and mailsql database for typo's. You can debug all you want, but if you're not passing the right information back and forth to your mail system, it's not going to work. If you make a change to a config file for a service, make sure you restart that service so that the config change gets picked up.</p>
727 <pre>
728 # <i>/etc/init.d/service restart</i>
729 </pre>
730 </body>
731 </section>
732 <section>
733 <title>Step 2: Are all the necessary services actually running?</title>
734 <body>
735 <p>If it's not running, start it up. It's awful hard to debug a service that isn't running. Sometimes a service will act like it's started but still not function. Sometimes, when a bad config is used, or a bad transmission comes into a mail component, the service will hang and keep the port from being used by another process. Sometimes you can detect this with netstat. Or, if you've been at it awhile, just take a break and reboot your box in the meantime. That will clear out any hung services. Then you can come back fresh and try it again.</p>
736 <pre>
737 # <i>/etc/init.d/$service status</i>
738 # <i>netstat -a | grep $service (or $port)</i>
739 </pre>
740 </body>
741 </section>
742 <section>
743 <title>Step 3: Are all the service using the current config's?</title>
744 <body>
745 <p>If you've recently made a change to a config file, restart that service to make sure it's using the current version. Some of the components will dump their current config's to you, like postfix.</p>
746 <pre>
747 # <i>apachectl fullstatus</i> (needs lynx installed)
748 # <i>apachectl configtest</i> (checks config sanity)
749 # <i>postconf -n</i> (will tell you exactly what param's postfix is using)
750 # <i>/etc/init.d/$service restart</i>
751 </pre>
752 </body>
753 </section>
754 <section>
755 <title>Step 4: Check the logs.</title>
756 <body>
757 <p>Repeat after me, logs are my friend. My next troubleshooting stop is always the logs. Sometimes it's helpful to try a failed operation again then check the logs so that the error message is right at the bottom (or top depending on your logger) instead of buried in there somewhere. See if there is any information in your log that can help you diagnose the problem, or at the very least, figure out which component is having the problem.</p>
758 <pre>
759 # <i>kill -USR1 `ps -C metalog -o pid=`</i>(to turn off metalog buffering)
760 # <i>nano -w /var/log/mail/current</i>
761 # <i>cat /var/log/mysql/mysql.log</i>
762 # <i>tail /var/log/apache/error_log</i>
763 </pre>
764 <p>You may also find the debug_peer parameters in main.cf helpful. Setting these will increase log output over just verbose mode.</p>
765 <pre caption="adding debug_peer support">
766 # <i>nano -w /etc/postfix/main.cf</i>
767 debug_peer_level = 5
768 debug_peer_list = $host.domain.name
769 <codenote>Uncomment one of the suggested debugger</codenote>
770 <codenote>commands as well.</codenote>
771 </pre>
772 </body>
773 </section>
774 <section>
775 <title>Step 5: Talk to the service itself.</title>
776 <body>
777 <p>SMTP, IMAP, and POP3 all respond to telnet sessions. As we've seen earlier when we verified postfix's config. Sometimes it's helpful to open a telnet session to the service itself and see what's happening.</p>
778 <pre>
779 # <i>telnet localhost $port</i>
780 <codenote>SMTP is 25, IMAP is 143, POP3 is 110. You should receive at least an OK string,</codenote>
781 <codenote>letting you know that the service is running and ready to respond to requests.</codenote>
782
783 Trying 127.0.0.1...
784 Connected to localhost.
785 Escape character is '^]'.
786 * OK Courier-IMAP ready. Copyright 1998-2002 Double Precision, Inc.
787 </pre>
788 </body>
789 </section>
790 <section>
791 <title>Step 6: Sometimes only the big guns will give you the information you need: strace.</title>
792 <body>
793 <p>You should have this installed anyway. This is an invaluable tool for debugging software. You can start commands from the command line with strace and watch all the system calls as they happen. It often dumps a huge amount of information, so you'll either need to watch it realtime as you retry a failed transaction with the mail system, or dump the output to a file for review.</p>
794 <pre>
795 # <i>emerge strace</i>
796 # <i>strace $command</i>
797 # <i>strace -p `ps -C $service -o pid=`</i>
798 </pre>
799 </body>
800 </section>
801 <section>
802 <title>Step 7: Research</title>
803 <body>
804 <p>Once you have the information, if you can diagnose and fix the problem, great! If not, you'll probably need to go digging on the net for information that will help you fix it. Here's a list of sites you can check to see if your error has already been resolved. There's also a really good howto on setting up smtp-auth which contains some great debugging ideas.</p>
805
806 <ul>
807 <li>
808 <uri>http://forums.gentoo.org/</uri> - Great forums for gentoo users</li>
809 <li>
810 <uri>http://bugs.gentoo.org/</uri> - Bugs database for gentoo - great place to look for specific errors</li>
811 <li>
812 <uri>http://postfix.state-of-mind.de/</uri> - smtp-auth howto</li>
813 <li>
814 <uri>http://marc.theaimsgroup.com/?l=postfix-users</uri> - Postfix mailing lists - searchable</li>
815 <li>
816 <uri>http://sourceforge.net/mailarchive/forum.php?forum_id=6705</uri> - Courier-imap mailing list archives - not searchable</li>
817 <li>
818 <uri>http://www.google.com/</uri> - If all else fails, there's always google, which has never failed me</li>
819 <li>I also spend a lot of time on irc.freenode.net #gentoo. Irc is a great place to go for help.</li>
820 </ul>
821
822 </body>
823 </section>
824 </chapter>
825 </guide>

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