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Old 09-17-2009, 09:40 PM   #1
Registered: Jan 2007
Posts: 39

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postfix ports?

does postfix (or smtp servers) have one port for clents to access and one port to communicate with servers? I'm trying to block clients from accessing the server to submit email and to force them to use my web interface.
p.s. I looked at blocking smtp traffic from outside and to allow only from the localhost. but that would block server to server connections. very undesireable.
Old 09-17-2009, 10:54 PM   #2
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Registered: Apr 2007
Location: Portland, OR
Distribution: Debian, Android, LFS
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I was having a similar issue... LQ users helped me get it sorted:

Note: you have to turn the postfix filter on, as it is not on by default in debuntu. See confs in /etc/fail2bind

And yes, I suppose you could receive mail on 465 and relay on 25, or vice versa... but I don't think that's going to solve your problem.

Last edited by jhwilliams; 09-17-2009 at 10:58 PM.
Old 09-23-2009, 03:43 PM   #3
Registered: Jan 2007
Posts: 39

Original Poster
Rep: Reputation: 15
think I have the answer

upon further study/research I found that port 25 is used for smtp server to server connections. and MUAS use port 587 to submit mail to the smtp server. so that should do it for me.
thanks to all who replied. I really appreciate it!


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