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    Exchange 5.5 unauthorized mail relay


    by jstajduhar ·

    Our exchange server is being used as an unauthorized spam server – but it is not an open relay. The unidentified spammer is changing the FROM field to reflect their intended recipient (ie then sending the spam to an invalid person onour server (ie What happens is our server bounces the mail forward to Bob@yahoo (not the spammer)with a non-delivery message along with the spam message. It makes it look like we sent the spam when actually we bounced it as a bad address, but instead of bouncing it back it goes to the substituted address in the FROM field. Microsoft had no solution… Any ideas?

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