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Inbound Mail Failure

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by jcbrito_77

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My question is how can i find out were this Inbound mail Failure is coming from I'm currently running NT 4.0 service pack 6 with exchange 5.5 service pack 4.0. I would like to know if my server is the one with the problem. I got about 1000 of these notifications yesterday

MSEXCH:IMS:Merit Abrasives:nt_mis:NT_MIS 0 (000C05A6) Unknown Recipient
astraitfan@earthlink.net
MSEXCH:IMS:Merit Abrasives:nt_mis:NT_MIS 0 (000C05A6) Unknown Recipient
astraitnut@earthlink.net
MSEXCH:IMS:Merit Abrasives:nt_mis:NT_MIS 0 (000C05A6) Unknown Recipient
astraiton@earthlink.net

Not sure what I'm suppose to do to fix the problem.

3 replies

by jordana

Without seeing all the logs, a couple of things I would look into.

1. Is your relay open? If so, these could be replies to your server because it was used to relay spam.
2. If your relay is closed, someone might have tried using it as a relay and these are the error messages.

Are they all to the same address, same subject? are all the errors identical? Did it just happen yesterday, or is this an ongoing thing?

You could bump up the loggin on your IMS for SMTP services to High...Jordan

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