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Sunny

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External gmail sent to one user with know good address "550 5.1.1 User unknown" We recent migration to Cloud Office 365.

Recent migration to Cloud Office 365.

Test to self - OK
Test to external gmail address - OK
Reply from that email ...

Mail Delivery Subsystem <mailer-daemon@googlemail.com>
10:32 (41 minutes ago)
to me

Error
Address not found
Your message wasn't delivered to zzzzzz@zzz.com because the address
couldn't be found or is unable to receive email.
The response from the remote server was:
550 5.1.1 User unknown




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Avatar of David Favor
David Favor
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