Are you sure that your upstream provider completed the reverse delegation
of the address set to your DNS servers? If they didn't then your entries
in-addr will not be recongnized.
----- Original Message -----
From: Malcolm Joosse <firstname.lastname@example.org>
To: NTISP <email@example.com>
Sent: Friday, October 22, 1999 9:27 PM
Subject: [NTISP] Weird SMTP problems
> Hello List,
> I have recently changed backbone providers and have noticed a few email
> We run NT only with NTMail 3.02M and Pri/Sec DNS servers local.
> I am having trouble with about 5 email domains that cannot seem to send or
> recieve to my clients mailservers on my network. They can send/recieve
> from many other domains like hotmail.com, aol.com and others, so I cannot
> beleive there is a DNS problem
> I have watched the SMTP log and noticed that when their server connects
> seems ok,
> we connect then I see an error 521 customerdomain.com does not resolve. I
> donot know why it is trying to resolve our customers domain and not the
> mailserver domain name
> I have also noticed that we connect to their server but then I get
> mail.theirserver.com closed the connection.
> I can't tell where the problem lies, but I have completed the reverse DNS
> registration about 5 days ago, but I do not think this is the cause.
> Please help
> Malcolm Joosse
> The Hotline Services Group Pty Ltd
> PO Box 302
> WILLOUGHBY NSW 2068
> NEW Fax: 61 2 89049666
> Visit www.hotline.net.au <http://www.hotline.net.au/> and 'add to
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