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I can't find the source of unwanted domain name re-writing

From: Rob Tanner (rtannerlinfield.edu)
Date: Tue May 01 2007 - 18:59:17 CDT


Hi,

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?

Thanks,
Rob

--
Rob Tanner
UNIX Services Manager
Linfield College, McMinnville OR