I am transitioning from Exchange 2003 to 2007 and receiving a LegacyDN email address issue for external mail. Internal mail is working properly and all addresses are being resolved from the GAL. However, when a user sends mail externally, their email address appears as
Replying to that email address causes an NDR. If you send type the email address manually, firstname.lastname@example.org. The email is sent and received without an issue.
I have been researching this all morning and can't seem to find anything that deals with the issue with external mail.
I have added the old X500 address in the ProxyAddress list for a test user, but am still experiencing an issue.
X500:/O=/OU=FIRST ADMINISTRATIVE GROUP/CN=RECIPIENTS/CN=@Organzation.org
When using OWA, the same issue occurs, so we can rule out anything dealing with the local mail client.
I have created a new mailbox and the external mail address works properly. This is only occurring with moved/upgraded mailboxes.
Does anyone have any ideas?