Postfix sends to original recipient name instead of alias name

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http://serverfault.com – I have setup Postfix as part of my ISPConfig implementation. It should just forward all mail. Clients should be able to define a new alias and receive mail on a different e-mail address, using ISPConfig. Example: A mail sent to [email protected] should be forwarded to [email protected] This works fine but one important thing. When opening the mailbox for [email protected] I see the mail with the original sender name, and the original recipient name, i.e. [email protected] I have tried the forward function and the send copy function on a mailbox. Both show the original recipient user1@domai (HowTos)