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Old 04-18-2006, 04:32 PM   #1
Registered: Mar 2003
Posts: 36

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cannot telnet postfix smtp 25 on external ip

I need help with telnet xx.xx.xx.xx 25
I can telnet 25 and get the postfix program
I can telnet 25 and get the post fix program
however it is on
If I telnet xx.xx.xx.xx which is my external ip it gives me a connection refused error.

what needs to be configured. is this postfix issue or
something else?
Old 04-18-2006, 06:05 PM   #2
Registered: Oct 2003
Location: New York
Distribution: Debian Sid
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Many ISPs block port 25 to any IP other than their own mail servers to avoid spam.
Old 04-19-2006, 09:37 AM   #3
Registered: Mar 2003
Posts: 36

Original Poster
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thanks but thats not it.
I had a mail server before and was rebuilding it.
Old 04-20-2006, 02:27 PM   #4
LQ Newbie
Registered: Apr 2006
Posts: 21

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You can attempt to nmap the external IP to see if something is listening on 25 or if 25 if filtered.

I assume if you have a firewall or gateway of some sort, that 25 is forwarded to the IP of the mail server? If not, check that first.

Old 04-20-2006, 03:32 PM   #5
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I can telnet 25 and get the post fix program
however it is on
I don't understand the above statement. What does "it" refer to?

What's the output of
postconf inet_interfaces


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