1. Had an old SBS 2003 server with about 10 users .
2. Configured new SBS 2011 server. Instead of migrating users, I created new domain and re-created users. Imported PST files into each mailbox.
3. Joined each computer to the new domain and setup Outlook.
Problem: Mail looked like it was working fine, until internal users started getting bounce backs to other internal users. External mail seems to be unaffected.
In the Bounce back e-mail: Each users is listed with the following error:
The e-mail address you entered couldn't be found. Please check the recipient's e-mail address and try to resend the message. If the problem continues, please contact your helpdesk.
#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##
I found a lot of people had similar problems, it’s related to old x500 e-mail address from 2003 server.
They say to add the x500 address to the problem account, but I can’t figure out exactly how to get the x500. I looked at the old server and it has a x400 e-mail.
Any help would be great.