Recently I was trying to email a user whose account was recently deleted. Instead of the usual error:
#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##
I got a "Not Authorized" error instead"
#550 5.7.1 RESOLVER.RST.NotAuthorized; not authorized ##
Turned out the account was recently deleted, and my company has a policy of moving a deleted account into a "Obsolete User" AD container for 35 days before permanently purging the AD account.
The NDR message is definitely inaccurate.
Is this another of Microsoft's fault or lazy/mis-configuration from the Exchange folks?
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