Erwin Hoffmann <[EMAIL PROTECTED]> writes:
> Hi,
>
> I dont know, whether the HELO/EHLO from the MTA-Client means anything and
> whether it can be used for a reverse DNS lookup.
>
> However, it makes sense to do DNS lookup für the MAIL FROM: address.
>
> This is alrady feasable by some qmail patches, including my SPAMCONTROL.
> Have a look at:
>
> http://www.fehcom.de/qmail_en.html
It's not unreasonable to insist that that address be valid (including
<> and such). I dont' think it's particularly *useful* for spam
control either, though; most spam comes with forged by "valid" return
addresses. By insisting that spammers do that, all we're doing is
forcing them to pick some unlucky sysadmin to get the torrent of abuse
and bounces. So the spam doesn't get blocked, *and* some innocent
victim is hurt. No profit there!
--
David Dyer-Bennet / Welcome to the future! / [EMAIL PROTECTED]
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