Apr 15, 2009 10:02 AM|filippg|LINK
I experienced the same Problem in an HMC 4.0-Environment today. Environment was setup some time ago, has 2.000 users, everything's fine. Added a new Hub-Transport-Server, everything's fine. Added this new Hub-Transport as Source-Server for the Internet Mail-Connector
-> Mails sent through the new Server showing IMCEAEX-Adresses as Sender addresses. Message-Tracking shows, that Envelope-From ist correct, only Header-From is wrong.
So, it's definitely not a case of user-object-/mailbox-configuration, it has to do something with the hub-server.