Re: server rejects messages

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You need to make sure that you have SMTP Protocol logging enabled
(properties of the SMTP Virtual Server). With that on, you can look through
the logs and see if that remote system is even making a connection to your
server, or if it is being kicked back somewhere else.

The other thing you might try doing is letting us know what the actual
domain names are. When you mask everything with domainxx.com, it makes it
very hard to troubleshoot what is going on.

--
Ben Winzenz
Exchange MVP
MessageOne
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http://winzenz.blogspot.com
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"MR" <comconix@xxxxxxxxxxxxxxxx> wrote in message
news:eQoBqPR0GHA.4044@xxxxxxxxxxxxxxxxxxxxxxx
Some of our clients have been complaining that email they send to us keeps
bouncing back to with the following error message:

Recipient address: @Server.domainxx.com:User@xxxxxxxxxxxxxxxxx
Original address: User@xxxxxxxxxxxx
Reason: SMTP transmission failure has occurred
Diagnostic code: smtp;550 5.7.1 Requested action not taken: message
refused
Remote system: dns;Server.domainxx.com
(TCP|10.11.1.11|65002|62.190.112.34|25)


It is fairly consistent that some clients cannot send us ANY mail, it all
gets bounced back at them. we can't figure out why or where the messages
are being rejected. we are not filtering any senders or recipients
(except we do "Filter recipients who are not in the Directory".)
Is there a way to specify which domains or users are valid senders? (not
all the senders have fixed IP addresses.)
is there a way to figure out where the problem is occurring?

Our configuration is Exchange 2003 with SP2 (Version: 6.5.7638.1) on
windows 2003 Enterprise Server
we have installed the Intelligent message filtering on the Exchange Server
with the Blocking threshold set at 6 and the move threshold set at 4. we
have tried to relax the blocking threshold but that did not help (but it
did allow more SPAM thru).

thanks for your help
m



.

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