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Old 28th February 2006, 19:17
kisong kisong is offline
Join Date: Oct 2005
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Angry Problem sending mail to 2nd SMTP server inside network

I've setup Postfix under Fedora Core 4 using ISPConfig and the "Perfect setup Guide" from this website.

This box is connected directly to the Internet on IP address The mx server information is at

On my internal network, there is a LISTSERV server. It has an internal IP address of It has an MX record of at (This IP address of is routed to the using NAT routing).

When an e-mail goes to, it is routed perfectly. The listserv works flawlessly, both receiving and sending messages.

However, when a message is sent to from WITHIN our network, the following error message occurs:

Feb 28 12:10:18 mail postfix/smtpd[2817]: connect from unknown[]
Feb 28 12:10:18 mail postfix/smtpd[2817]: D2B963578A3: client=unknown[]
Feb 28 12:10:18 mail postfix/cleanup[3446]: D2B963578A3: message-id=<>
Feb 28 12:10:18 mail postfix/qmgr[2578]: D2B963578A3: from=<>, size=541, nrcpt=1 (queue active)
Feb 28 12:10:18 mail postfix/smtp[3480]: connect to[]: Connection refused (port 25)
Feb 28 12:10:18 mail postfix/smtp[3480]: D2B963578A3: to=<>, relay=none, delay=0, status=deferred (connect to[]: Connection refused)
Feb 28 12:10:18 mail postfix/smtpd[2817]: disconnect from unknown[]

Is there a setting/conf file that I need to change so that the messages from WITHIN our network are routed properly and not refused by the LISTSERV?

I'm pretty sure it has something to do with how Postfix sends the message to the LISTSERV, but I can't seem to find out how to do this properly.

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