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I have On-premise relay scenario and suddenly I cannot send mail from on-premise exchange or from external mail to just one mailbox stored into cloud. Another cloud user is able to get any mail.
Error (reverted mail):
#5.2.0 smtp;550 5.2.0 RESOLVER.ADR.BadPrimary; recipient primary SMTP address
is missing or invalid> #SMTP#
Delivery has failed to these recipients or groups:
There's a problem with the recipient's mailbox. Please try resending the message. If the problem continues, please contact your helpdesk.
Diagnostic information for administrators:
Generating server: XXX
#550 5.2.0 RESOLVER.ADR.BadPrimary; recipient primary SMTP address is missing or invalid ##
I WAS ABLE to send mail to this user 3-4h ago ?!?!
What did I change ...?!
You're right, primary SMTP mail is missing. Now, I remembered that I add to that problematic user additional allias address - through AD - but problem was in new SMTP address: hint: there could be only one address added with capital SMTP, all other must be small smtp.
I’m glad to hear that the root cause of this Exchange issue has been found. It is my pleasure to work with you. At this point, I would like to confirm if you have any other questions on this issue.
Have a nice day.
No, I don't have other question on this issue.