[NTISP] Weird SMTP problems

Malcolm Joosse ( (no email) )
Sat, 23 Oct 1999 11:27:06 +1000

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 all
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
NEW Fax: 61 2 89049666
Visit www.hotline.net.au <http://www.hotline.net.au/> and 'add to
This email message and any attachments are intended only for the use of
the addressee named above and may contain information that is privileged
and confidential. If you are not the intended recipient, any
dissemination, distribution, or copying is strictly prohibited. If you
received this email message in error, please immediately notify the
sender by replying to this email message or by telephone. Thank you.

For more information about this list (including removal) go to: