You must have some sort of firewall active.Yep, modern linux distros ship with iptables - and a pretty easy lockdown.
Well that won't happen - for instance with red hat you don't really "turn off relaying", but you would havr to go to some lengths to allow any relaying at all - by default redhat accepts smtp connections from localhost only.Ed Wilts offers very good advice. I agree with him. Be sure to turn off relaying in sendmail (or whatever your_preferred_MTA is), or at least set up very secure mail relaying for your domain only. First thing that will happen is spammers attack your mail server and use it as a relay.
(In any case, we've moved to postfix)
Joe
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