Here's a question: When your mail server sends mail by smtp it goes out
on port 25. Any ideas of the range the responses will come on? When
your server receives mail, the connection will always be incoming on
port 25, but when you send messages from your server, they will go out
25 and the responses messages will come on other ports. The reason
behind this is if in your router, you block all packets to your
mailserver other than port 25, you can receive mail without a problem,
but you can no longer send mail. I have recorded packets in the 2000s
and 3000s as reponse messages, of course coming with a source port of
25. As far as I know, you can not permit packets in the cisco based on
source port, only destination.
Is there a rule that defines the ports the responses will return on?
Greg
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