When a certain user send an email to another internal email address, he always get the #550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found. The full error message is below:
#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##
The person "firstname.lastname@example.org" is no longer at the company resulting in the error. How do I get rid of this email address from our Exchange 2007 server?