From: Magnus Bäck (magnusdsek.lth.se)
Date: Tue May 01 2007 - 23:29:45 CDT

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On Wednesday, May 02, 2007 at 01:59 CEST,
     Rob Tanner <rtannerlinfield.edu> wrote:

> We're going to be offering a permanent email forwarding benefit for
> our alumni, and I'm using a virtual domain for that purpose. All the
> forwarding (once I figured out all the bits and bobs) works just fine.
> But what's happening is that the domain from the "From:" header is
> being rewritten somewhere, but I don't know where. Our regular domain
> is linfield.edu and the alumni domain is alumni.linfield.edu. The
> envelope is alumni.linfield.edu and the mail gets properly forwarded,
> so that part is fine. I don't do anything with canonical rewrites
> (never used them; I'd have to figure out how if I ever needed to). So
> what could cause alumni.linfield.edu to be rewritten to linfield.edu?

Do provide configuration ("postconf -n" output) and the logs of a
message being sent.

http://www.postfix.org/ADDRESS_REWRITING_README.html
http://www.postfix.org/DEBUG_README.html#mail

--
Magnus Bäck
magnusdsek.lth.se

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