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

[Michael Anthon]

Are you running sendmail?
I was poking around one of the junk mail ISPs in the US trying to figure 
out how to remove my name and came across quite a good bit of info on 
preventing your mail server from being used to relay mail from 
unauthourised addresses.

I can't verify this atm but i think it was www.iemmc.org

This is *NOT* an endorsment of those vermin who send out unsolicited junk 
mail........

Regards
Michael Anthon

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On Wednesday, November 05, 1997 6:15 PM, Steve Pinel 
[SMTP:Stevep at ssc.qld.edu.au] wrote:
> 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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