Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Debian Wheezy) - Page 4

12 Test Postfix

To see if Postfix is ready for SMTP-AUTH and TLS, run

telnet localhost 25

After you have established the connection to your Postfix mail server type

ehlo localhost

If you see the lines

250-STARTTLS

and

250-AUTH PLAIN LOGIN

everything is fine:

root@server1:/usr/local/sbin# telnet localhost 25
Trying ::1...
Connected to localhost.localdomain.
Escape character is '^]'.
220 server1.example.com ESMTP Postfix (Debian/GNU)

<-- ehlo localhost
250-server1.example.com
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN

<-- quit
221 2.0.0 Bye
Connection closed by foreign host.
root@server1:/usr/local/sbin#

Type

quit

to return to the system shell.

 

13 Populate The Database And Test

To populate the database you can use the MySQL shell:

mysql -u root -p

USE mail;

At least you have to create entries in the tables domains and users:

INSERT INTO `domains` (`domain`) VALUES ('example.com');
INSERT INTO `users` (`email`, `password`, `quota`) VALUES ('sales@example.com', ENCRYPT('secret'), 10485760);

(Please take care that you use the ENCRYPT syntax in the second INSERT statement in order to encrypt the password!)

If you want to make entries in the other two tables, that would look like this:

INSERT INTO `forwardings` (`source`, `destination`) VALUES ('info@example.com', 'sales@example.com');
INSERT INTO `transport` (`domain`, `transport`) VALUES ('example.com', 'smtp:mail.example.com');

To leave the MySQL shell, type

quit;

For most people it is easier if they have a graphical front-end to MySQL; therefore you can also use phpMyAdmin (in this example under http://192.168.0.100/phpmyadmin/ or http://server1.example.com/phpmyadmin/) to administrate the mail database. Again, when you create a user, go sure that you use the ENCRYPT function to encrypt the password:

I do not think I have to explain the domains and users table further.

The forwardings table can have entries like the following:

source destination  
info@example.com sales@example.com Redirects emails for info@example.com to sales@example.com
@example.com thomas@example.com Creates a Catch-All account for thomas@example.com. All emails to example.com will arrive at thomas@example.com, except those that exist in the users table (i.e., if sales@example.com exists in the users table, mails to sales@example.com will still arrive at sales@example.com).
@example.com @anotherdomain.tld This redirects all emails to example.com to the same user at anotherdomain.tld. E.g., emails to thomas@example.com will be forwarded to thomas@anotherdomain.tld.
info@example.com sales@example.com, billing@anotherdomain.tld Forward emails for info@example.com to two or more email addresses. All listed email addresses under destination receive a copy of the email.

The transport table can have entries like these:

domain transport  
example.com : Delivers emails for example.com locally. This is as if this record would not exist in this table at all.
example.com smtp:mail.anotherdomain.tld Delivers all emails for example.com via smtp to the server mail.anotherdomain.com.
example.com smtp:mail.anotherdomain.tld:2025 Delivers all emails for example.com via smtp to the server mail.anotherdomain.com, but on port 2025, not 25 which is the default port for smtp.
example.com

smtp:[1.2.3.4]
smtp:[1.2.3.4]:2025
smtp:[mail.anotherdomain.tld]

The square brackets prevent Postfix from doing lookups of the MX DNS record for the address in square brackets. Makes sense for IP addresses.
.example.com smtp:mail.anotherdomain.tld Mail for any subdomain of example.com is delivered to mail.anotherdomain.tld.
* smtp:mail.anotherdomain.tld All emails are delivered to mail.anotherdomain.tld.
joe@example.com smtp:mail.anotherdomain.tld Emails for joe@example.com are delivered to mail.anotherdomain.tld.

See

man transport

for more details.

Please keep in mind that the order of entries in the transport table is important! The entries will be followed from the top to the bottom.

Important: Postfix uses a caching mechanism for the transports, therefore it might take a while until you changes in the transport table take effect. If you want them to take effect immediately, run

postfix reload

after you have made your changes in the transport table.

 

14 Send A Welcome Email For Creating Maildir

When you create a new email account and try to fetch emails from it (with POP3/IMAP) you will probably get error messages saying that the Maildir doesn't exist. The Maildir is created automatically when the first email arrives for the new account. Therefore it's a good idea to send a welcome email to a new account.

First, we install the mailx package:

apt-get install mailutils

To send a welcome email to sales@example.com, we do this:

mailx sales@example.com

You will be prompted for the subject. Type in the subject (e.g. Welcome), then press ENTER, and in the next line type your message. When the message is finished, press ENTER again so that you are in a new line, then press CTRL+D; if you don't want to cc the mail, press ENTER again:

root@server1:/usr/local/sbin# mailx sales@example.com
Subject: Welcome <-- ENTER
Welcome! Have fun with your new mail account. <-- ENTER
<-- CTRL+D
Cc: <-- ENTER
root@server1:/usr/local/sbin#

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9 Comment(s)

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Comments

From: Anonymous at: 2014-02-26 13:13:45

Hi,

I succesfully installed according to these instructions and almost everything is working fine.

 Only thing which is not working is SMTP authentication. If I try to add account to Outlook outlook just keeps asking password and username for the SMTP server. Auth.log shows this:

 Feb 26 14:58:37 l119 postfix/smtpd[26228]: sql plugin try and connect to a host
Feb 26 14:58:37 l119 postfix/smtpd[26228]: sql plugin trying to open db 'mail' on host '127.0.0.1'
Feb 26 14:58:37 l119 postfix/smtpd[26228]: sql plugin Parse the username firstname.lastname@domain.com

 I changed the SMTP port to 587 before that change i did not even get a connection to the SMTP.

Anybody can help me?

 

From: Kadu Lessa at: 2014-07-27 19:09:24

Hi, 

Have you corrected this problem? How to fixed this? I trying to fix this for a week!

Thanks 

From: Anonymous at: 2013-07-11 21:24:59

I'm stuck at the postfix installation:

mkimapdcert
bash: mkimapdcert - command not found
mkpop3dcert
bash: mkpop3dcert - command not found

locate mkpop3dcert
none?

Can anyone know what's the catch here?

From: Jidifi at: 2013-11-05 19:31:09

To anonymous:

You have run 'mkimapdcert' and 'mkpop3dcert' commands as root of course ?

From: Jidifi at: 2013-11-05 18:31:11

Excellent tutorial, even for those who have

lilliputian networks.

Everything works fine, but this guide must be

read very carefully to be fully useful.

Mind nevertheless the syntax of the command

"postconf -e" which may differ with some linux distro.

Thanks a lot.

 

 

 

From: Marcus at: 2014-03-09 23:57:08

Great Tutorial you made. I have a small question.

When i ran "tail -f /var/log/mail.info" i see many lines saying me:

"amavis[18304]: Net::Server: Ran out of accept retries! "

What could that be?

Best Regards, Marcus 

From: fly at: 2015-01-02 07:27:27

Hello Sir Falko:

This a very good guide to set up my server. and Great thanks to you.

Here I have one problems confused me a lot.

After Finished the steps as you showed, I found when i mailx my users registered in mail database of mysql, it can not automatically generate the folders for users in the path of ../vmail/ . I have checked ,but can not found where is the problem. can you help me ?

Best wishes.

JI

From: schmoove at: 2015-02-04 15:32:36

For anyone updating from Squeeze to Wheezy and getting login failures when connecting to smtp, with errors in '/var/log/mail.log':

"[...]postfix/smtpd[...]: warning: unknown[xxx.xxx.xxx.xxx]: SASL LOGIN authentication failed: no mechanism available"

Double-check your '/etc/postfix/sasl/smtpd.conf', there are slight changes. The tutorial further up this page reflects those changes. They are practically

--auxprop_plugin: mysql

--sql_select: select password from users where email = '%u'

++auxprop_plugin: sql

++sql_engine: mysql

++sql_select: select password from users where email = '%u@%r'

From: heq at: 2015-03-03 02:12:12

After add ipv6 address to mynetworks, postfix will accept relay from squirrelmail,

postconf -e 'mynetworks = 127.0.0.0/8 [::1]/128'