[H-GEN] Relaying outside mail through my server.

[Steve Pinel]

Talking of mail servers, I just looked through the mail log for the past
couple of days, and noticed that one mail message has been sent by someone
not within the school to someone else not within the school.

Now, we have a dialup connection, with a dynamic IP address assigned each
time we connect (several times a day).  The mail server, which is a Mac
running EIMS,  is really only intended as an internal affair, but is able
to pass mail out to the real world (our oficial email server is
administered by our ISP).  It is outside the firewall (Vivom Gateway), and
so is accessible to anyone on the internet, but with IP addresses changing
every few hours and no DNS entries, I find it hard to believe that this
could have happened without some effort on someones behalf.

Firstly, can anyone tell me why this might have happened?

Secondly, what sort of security threat does this pose?

Thirdly, what can I do (technically and legally) to stop this happening again?

Thanks very much

Steve 'a bit concerned' Pinel


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