I have now migrated from Exchange 2010 to exchange 2013. In doing so I deleted several outside email contacts.
Now when they reply to an email from one of these contacts it gets replaced with this:
:/o=ABC/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=someone
However, when they forward the message and type in the email it works. It seems only to happen when they reply back to the contact.
I did have them clear out there outlook cache with that contact but it still happens.
How can I prevent this from happening?