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#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ## returned for live mailbox

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I have a client on Microsoft Office 365 Plan P1, a person sending email to them is receiving the following bounceback message:

#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##

but the account seems to be working normally apart from this issue. Please advise.



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