Linux Mail Server Setup and Howto Guide

Hi there,

i followed your guide from http://www.linuxmail.info/post…..-centos-5/ .

im running 2 debian server:

androktasia: postfix+dovecot

dione: openldap

dovecot works so far – which means i can login via telnet localhost smtp with an ldap user.

even postmap -q bruce.wayne@testenterprise.com ldap:/etc/postfix/ldap-users.cf works with the result:

bruce.wayne/Maildir/

but if i try to test postfix via telnet:

androktasia:~# telnet localhost smtp
Trying 127.0.0.1…
Connected to localhost.
Escape character is '^]'.
220 androktasia.testenterprise.com ESMTP Postfix (Debian/GNU)
mail from: john
250 2.1.0 Ok
rcpt to: bruce.wayne
550 5.1.1 <bruce.wayne>: Recipient address rejected: User unknown in local recipient table
rcpt to: bruce.wayne@testenterprise.com
Connection closed by foreign host.

Mail.log says:
Mar 21 17:40:19 androktasia postfix/smtpd[20309]: connect from localhost[127.0.0.1]
Mar 21 17:40:31 androktasia postfix/smtpd[20309]: 17C3661F5D: client=localhost[127.0.0.1]
Mar 21 17:40:35 androktasia postfix/smtpd[20309]: 17C3661F5D: reject: RCPT from localhost[127.0.0.1]: 550 5.1.1 <bruce.wayne>: Recipient address rejected: User unknown in local recipient table; from=<john> to=<bruce.wayne> proto=SMTP
Mar 21 17:40:56 androktasia postfix/master[20300]: warning: process /usr/lib/postfix/smtpd pid 20309 killed by signal 6
Mar 21 17:40:56 androktasia postfix/master[20300]: warning: /usr/lib/postfix/smtpd: bad command startup — throttling

Why is this happening? Which is the correct rcpt? just bruce.wayne or the full address?

http://nopaste.info/10c5bcf58a.html main.cf

http://nopaste.info/d861a6a89b.html ldap-users.cf

Thanks for any help!

okay, but why does telnet/postfix crash if i enter the full address?

Mar 21 17:40:56 androktasia postfix/master[20300]: warning: process /usr/lib/postfix/smtpd pid 20309 killed by signal 6
Mar 21 17:40:56 androktasia postfix/master[20300]: warning: /usr/lib/postfix/smtpd: bad command startup — throttling

this error is assosiated with the using of the full address

Hi there,

i figured it out. Now everything works as expected.

I will post the solution later.

But thanks for your effords so far.

Solution is quite simpel, will be at bottom of this post. I will give a report of my way – if you're not interested you can skip this ;)

After setting postfix into verbose mode in master.cf (-v in line 11) i figured out, that it was an ldap problem.

mail.log said:

Apr  1 16:31:20 androktasia postfix/smtpd[26396]: dict_ldap_lookup: In dict_ldap_lookup
Apr  1 16:31:20 androktasia postfix/smtpd[26396]: dict_ldap_lookup: No existing connection for LDAP source /etc/postfix/ldap-users.cf, reopening
Apr  1 16:31:20 androktasia postfix/smtpd[26396]: dict_ldap_connect: Connecting to server ldap://dione.myhost.de:389
Apr  1 16:31:20 androktasia postfix/smtpd[26396]: dict_ldap_connect: Actual Protocol version used is 3.
Apr  1 16:31:20 androktasia postfix/master[25958]: warning: process /usr/lib/postfix/smtpd pid 26396 killed by signal 6
Apr  1 16:31:20 androktasia postfix/master[25958]: warning: /usr/lib/postfix/smtpd: bad command startup — throttling

then i took a look into the corresponding ldap server-log file (after setting ldap into loglevelmode 256) /var/log/syslog  I figured out, that i was an authentication problem.

So i googled for "postfix ldap" to get to know which tls format postfix wants to have and found this post in the german debianforum (source: http://debianforum.de/forum/vi…..p;start=0)

"Habe das Problem gelöst.

Es lag daran, dass Postfix "dev/[u]random" aus der chroot-Umgebung nicht erreicht hat. Ein einfach aber simpler Workaround ist folgender:

mkdir /var/spool/postfix/dev
cp -a /dev/random /var/spool/postfix/dev
cp -a /dev/urandom /var/spool/postfix/dev

Und schon funzt alles wie es soll. Andere Möglichkeit wäre Postfix aus chroot-umgebung rauszunehmen aber dies ist sicherheitstechnisch bedenklich. "

Roughly said in english:

"Postfix could not access "/dev/[u]random" from chroot-environment. Simple Workarround:

mkdir /var/spool/postfix/dev
cp -a /dev/random /var/spool/postfix/dev
cp -a /dev/urandom /var/spool/postfix/dev

Now everything works as it should.Other possiiblity would be to take postfix out of the chroot-environment, but this is in the means of security very critical."

That worked for me!

Greetings from Germany and hail to your guide!