What causes this type of address in envelopes?

[Gottschalk, David]

I have something similar going on, just that it rewrites addresses to  user at serverhostname.com.

David Gottschalk
UTS Infrastructure Technology Services
david.gottschalk at emory.edu


-----Original Message-----
From: mailscanner-bounces at lists.mailscanner.info [mailto:mailscanner-bounces at lists.mailscanner.info] On Behalf Of Steve Campbell
Sent: Friday, September 28, 2007 2:09 PM
To: mailscanner at lists.mailscanner.info
Subject: What causes this type of address in envelopes?

I have a little problem with a from envelop address. All of the header
addresses are normal type somebody at somedomain.com, but the envelop from
address takes the form

prvs=somebody=7848db996 at somedomain.com.

The recipient is a little mad, because I had the address whitelisted
using the normal type address and it used to work. They want me to
whitelist it again. I guess I could resave my file, but....

Is it a proxy, or one of those dang MS products? Any clues?

Thanks in advance.

Steve Campbell

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