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Exchange 5.5 undeliverable mails

By powar ·
I have Internet Mail service running on exchange 5.5 server with 30-40 users all on NT4 workstation. While all the users have no problem in receiving mails (POP) there are some users who get an undeliverable mail message from System Administrator stating "The following receipent(s) could not be reached:' followed by the email id as mentioned in the TO/CC/BCC field when sending out mails(SMTP).

I will appreciate if someone would advise where I may be going wrong.

Thanks & regards

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all outgoing email?

by jeffersnet In reply to Exchange 5.5 undeliverabl ...

If it is all of the outgoing email from these users it is most likely caused by incorrectly configured clients. Double check the users settings for outgoing email and make sure they go through the correct server. Try to use telnet to see if port 25 is open from the client to the server if the settings are correct.

telnet servername 25

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by powar In reply to all outgoing email?

its most intriguing that while mails are being delivered to some receipents, for others its being rejected with message 'Recipient name is not recognised' by microsoft outlook. I have no such problem when using outlook express. For example message is delivered to a recipient but not to Similarly there are other domains where its being rejected by exchange. Also this is only happening with a few user accounts on NT while others have no such problem.

Port setting are correct. Also firewall (winproxy 5.0 on win 2003 server) should not be a problem either.

I can trace the message in exchange queue. thereafter it briefly shows on the winproxy console.

I believe the problem is in user account created on NT4 server/exchange.

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by powar In reply to

I have been able to isolate the problem. Exchange requires the domain name of the ISP's mail server to be specified in the IMS settings. Now its working like a charm.

thanks for your contributions anyway.

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