Re: DNS return queries through isa2000 for exchange
- From: "Nuevo" <imaneophyte@xxxxxxxxx>
- Date: Thu, 20 Apr 2006 20:23:44 -0400
Does mail.XXXXXX.com represent your real domain name? I'd suggest contact
Comcast to understand exactly what they are doing and why. Lots of
organizations have devices after the last SMTP server and as long as the the
reverse dns entries are valid for the last hop then everything should be OK.
Nue
"Mehmut Of Io" <MehmutOfIo@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:23C4EDDD-CC43-4EAC-A5A8-CD4A97447BFA@xxxxxxxxxxxxxxxx
I recently stared having a problem where our email is being returned
without
delivery from comcast email servers. The return message is the following:
<mail.XXXXXX.com #5.5.0 smtp;521-EHLO/HELO from sender ###.###.###.###
does
not map to mail.XXXXXX.com in DNS>
(### is the ip address of the isa server)
I'm guessing that they recently started requiring a matching DNS reply
before accepting incoming email. I haven't changed anything on my end so
that
is why I assume the change came from them.
My exchange server is on the inside (NATed) of the network. The IP address
we have registered for the exchange server is actually setup as an outside
IP
address on the ISA server and then published and routed through there.
How do I get outgoing email appear to come from from exchange server
instead
of the isa server. Or is that not something I want to do?
.
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