Yesterday, I had a situation where a user was getting an NDR bounce-back after sending mail to a Distribution List in Exchange. Specifically, one person was listed in the error message: a contractor who had started last week.
To make a long story short, I had created a User object for this contractor so that they could get access to network resources but because he was a contractor, I did not create an Exchange mailbox for him. Instead, I created a Contact object pointing to his personal email address... with this Contact object having the same First and Last name as the User object.
When I added him to the corresponding Distribution List, I of course managed to add the email-deprived User object instead of the Contact object. Hey, the First Name and Last Name matched!
Needless to say, the error that popped up was:
#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##
After removing the User object from the Distribution List and then adding the Contact object, all was well.
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