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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 <>
10:32 (41 minutes ago)
to me

Address not found
Your message wasn't delivered to 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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David Favor
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