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remote users can't relay mail through my server.

Posted on 2011-02-15
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Last Modified: 2012-05-11
I am tryingto configure Postfix to allow a remote client to relay mail.
I am using CENT OS 5 with Webmin/virtual min as my webbased admin tools.
The users are ably to pop/imap in and get their mail. I can send mail localy but not from a remote client like Outlook.

it is using postfix as my outgoing mail service.
When I added the domain I did so through Virtualmin.
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Question by:jbrashear72
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by:jar3817
ID: 34902134
Probably because they're trying to relay mail from an outside IP address. The only reliable way to do that is to set up authentication and allow relay based on the auth.
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by:jbrashear72
ID: 34902172
How do I set up authentication to allow relay based on the auth.
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by:jbrashear72
ID: 34902739
All the settings from that post are correct. I still get rejected:


Feb 15 19:34:49 vm-1708 postfix/smtpd[28537]: connect from cpe-70-112-106-122.austin.res.rr.com[70.112.106.122]
Feb 15 19:34:49 vm-1708 postfix/smtpd[28537]: NOQUEUE: reject: RCPT from cpe-70-112-106-122.austin.res.rr.com[70.112.106.122]: 554 5.7.1
 <semfreak@gmail.com>: Relay access denied; from=<jason@fusionmedspa.com> to=<semfreak@gmail.com> proto=ESMTP helo=<JasonsI7>
Feb 15 19:34:52 vm-1708 postfix/smtpd[28537]: disconnect from cpe-70-112-106-122.austin.res.rr.com[70.112.106.122]

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by:jar3817
ID: 34902780
post your /etc/postfix/main.cf file.

Saslauthd is running? Did you restart postfix after making changes to the config?
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by:jbrashear72
ID: 34902839
That was is. I had to restart Saslauthd
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by:jbrashear72
ID: 34902967
Holy cow I reboted my system and I can no longer pop in.
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Expert Comment

by:jar3817
ID: 34902971
You probably didn't set saslauthd to start on boot. Try manually starting it.
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by:jbrashear72
ID: 34902978
Will that cause pop3/imap to fail?
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by:jbrashear72
ID: 34902984
service saslauthd status
saslauthd (pid 3744 3741 3740 3739 3738) is running...
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by:jbrashear72
ID: 34903002
OK so it looks like it is SMTP remptly that is not listening anymore.

I can telnet to localhost smtp and it connects.

telnet localhost smtp
Trying 127.0.0.1...
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
220 vm-1708.localdomain ESMTP Postfix

If I try to telnet to the domain it is not responding.
telnet fusionmedspa.com smtp
Trying 216.151.173.74...
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by:jbrashear72
ID: 34903022
Looks like my virtual interfaces for eth0 disapeared after I rebooted my system.
I created them through Webmin. Wonder why they disapeared after I rebooted?
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