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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 user1@domain1.com on my ISPConfig server should be forwarded to external mailbox user2@domain2.com This works fine but one important thing.

When opening the mailbox for user2@domain2.com I see the mail with the original sender name, and the original recipient name, i.e. user1@domain1.com

I have tried the forward function and the send copy function on a mailbox in ISPConfig. Both cases show the original recipient user1@domain.com instead of the final recipient user2@domain2.com, as it would when I manually forward an e-mail.

Can this be achieved without having to maintain a list for each entry? Thanks for looking into this.


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It sounds like you've described normal behavior for Internet e-mail. –  Michael Hampton Oct 18 '12 at 22:04
Thank you Michael. Maybe you are right. But if I manually forward an email to you, your mail address with be shown as recipient, and not mine. It seems like the behavior I am seeing is more like redirecting instead of forwarding. –  user141742 Oct 18 '12 at 22:23
Indeed, this is normal auto-forwarding behavior. –  SamB Oct 19 '12 at 1:14
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1 Answer

You are new to email and apparently don't know the difference between the MAIL TO: envelope recipient and any To: headers in the message itself.

These are not the same; see RFC5321 for details.

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