After pounding my head on the table for a few hours I found the cause...
Someone had change the mx record. It was pointing to a server where the email address did not exist. Thus rejecting the recipient.
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550 5.1.1 Recipient address rejected:
I have a bit of a puzzle on my hands... I can receive email from most of the free world, but I have several customers who receive the following error message when sending me an email:
550 5.1.1 <abcd@efg.com>: Recipient address rejected: efg.com
We have not made any changes to our email setup in the last three weeks. We moved from an external ISP (POP3) to an internal Exchange 2003 server.
Any suggestions on which way to run with this one would be greatly appreciated.
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by: leakim971Posted on 2009-11-04 at 15:37:28ID: 25745369
Hello CMIT_ChiNorth,
Check if the email abcd@efg.com is really an existing email in your organisation.
Regards.