my sendmail being attacked?

[m.w.chang]

yes, I opened port 25 while keeping an eye on the /var/log/mail for 
invalid relay errors (my sendmail relay only localhost and internal 
network). I want to appreciate the amount of attack from spammers.  :)

also, I want to learn using sendmail to receive messages.

> Double check your firewall.  It sure looks like port 25 is open to the
> world or they wouldn't have been able to access your mail server.  You
> can't do it from the mailserver itself.  Either telnet to port 25 from a
> system outside your network (ie from the other side of your firewall) or
> get someone else to do it for you.  If there is a connection then your
> port 25 is open.
> 

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