cannot telnet postfix smtp 25 on external ip

slam · 04-18-2006, 04:32 PM

I need help with telnet xx.xx.xx.xx 25
I can telnet 127.0.0.1 25 and get the postfix program
I can telnet domain.name 25 and get the post fix program
however it is on 127.0.0.0
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?

celejar · 04-18-2006, 06:05 PM

Many ISPs block port 25 to any IP other than their own mail servers to avoid spam.

slam · 04-19-2006, 09:37 AM

thanks but thats not it.
I had a mail server before and was rebuilding it.

ZST · 04-20-2006, 02:27 PM

Hi,

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.

Regards,
ZST

Berhanie · 04-20-2006, 03:32 PM

Quote:

I can telnet domain.name 25 and get the post fix program
however it is on 127.0.0.0

I don't understand the above statement. What does "it" refer to?

What's the output of

Code:

postconf inet_interfaces