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Can't send messages to certain addresses

By shanna ·
We are running Windows NT 4.0, Exchange 5.5 with SP4, and all client PCs are running either Outlook 98 or 2000.

All of our users are unable to send messages to any addressee with a "" or "" email address. The messages just sit in the outgoing IMS queue and eventually time-out. This problem has been occurring for the last 2 or 3 weeks, and there has been no server configuration changes on our end since the trouble started. There had been no problems with these adresses previously that I am aware of.

Does anyone have any suggestions as to where I can begin to look for a solution???? I have already contacted the folks at and they deny they're having any problems with their email servers.

Any assistance is greatly appreciated.

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Can't send messages to certain addresses

by 262noni In reply to Can't send messages to ce ...

This happened to us before I'm not sure if the reason is the same. Check if your system is an open relay. Some of the mails that come back carry this message and point you to a URL where you can check. You can also search the internet for "test for open relay" (try If you test positive then some domains detect this and you are blocked from sending them mails. You may try this:
1. in MS Exchange admin, go to CONNECTION,
2. tick on "Hosts and Clients with these IP
addresses" and leave the IP address table
3. Reset your Exchange and have your system
tested again for open relay. If test is
negative, then request that you be taken
off from their list.

I hope this helps.

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