Re: Return Path = my address = spam ...

Stephen Warren <[email protected]>
Newsgroups gmane.mail.spam.tmda.user
Message-ID <[email protected]>
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Adam Todd wrote:
> My spam load has mysteriously increased of late, that is the stuff getting 
> to my mail box.
> 
> After searching for an answer to this:
> 
> Date: Wed, 22 Nov 2006 10:26:11 +1100
> Sndr: [email protected]
> From: "Allen Fisher" <[email protected]>
>    To: at@[*]
> Subj: let now and your God hath he is in their hands on The
> Actn: OK (from-file /home/at/.tmda/lists/confirmed ok)                 (18067)
> 
> I realised that the sender was me and the recipient was me and bugger.  The 
>  From however was not!

The "canonical" solution to this is to configure your mail server to
reject all email purporting to be sent *from* your domain name except
from a specific set of hosts (e.g. your local LAN, your separate
inbound/outbound mail servers etc.)

Then, you setup authenticated SMTP, and allow *authenticated* users to
send mail *from* your domain. Reconfigure your mail clients to use SMTP
authentication, and you're set.

Typically, authenticated SMTP is run over SSL on a separate port to
regular inbound SMTP from "anonymous" remote sites.

This also solves the problem of taking your laptop somewhere and needing
to find the local ISP's outbound SMTP server - instead, simply use your own.
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