We are having an issue with emails not being forwarded outbound by Exchange 2013.
Scenario: We have users that need emails delivered to external email addresses (i.e. John.Doe@gmail.com)
These users are in our Exchange Server as contacts so when an email comes in to John.Doe@ourcompany.com the email should be redirected to their external gmail account.
Problem is for some users we are receiving NDRs. We were not experiencing this issue before we migrated from Exchange 2010 earlier this year.