RE: smtp issue - Anyone?
- From: "Deus, Attonbitus" <Thor@xxxxxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Thu, 09 May 2002 21:35:50 -0700
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At 07:26 PM 5/9/2002, you wrote:
>This means they are advertising themselves as one domain and appearing
>as another on a reverse lookup (as far as I can tell)... I can't
>understand why all our mail is not breaking though...
My experience is that many people do not use the reverse DNS feature- and
if they do, it is only to identify unqualified addresses in the header (as
Exchange 2000 does) but not to actually reject mail (as in a NDA) based on
that criteria.
Here's what a shmuck I was... I was actually trying to filter mail by
identifying the "unqualified" tag (or whatever Ex2K puts in the header) and
busting on people w/o proper reverse DNS entries when I noticed after
several months that my Ex2k server was sending out it's internal FQDN in
the headers, and not the reverse DNS resolvable name. But the entire
time, I never got a single mail back (that I know of), and this is at the
corporate level, that was rejected. After that, I did fix the name it
publishes, but turned off reverse look-up.
hth
AD
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