From owner-freebsd-questions@FreeBSD.ORG  Thu Mar 23 17:23:11 2006
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From: Charles Swiger <cswiger@mac.com>
Date: Thu, 23 Mar 2006 12:22:59 -0500
To: Steve Camp <steve@camp.com>
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Cc: "freebsd-questions@freebsd.org List" <freebsd-questions@freebsd.org>
Subject: Re: e-mail relaying without forwarding the entire message?
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On Mar 23, 2006, at 10:28 AM, Steve Camp wrote:
> The conversation that I envision would look something like:
>
>     -> MAIL FROM: <sender@somedomain.com>
>     <- 250 2.1.0 Sender ok
>     -> RCPT TO: <recipient@otherdomain.com>
>     <- XYZ X.W.V Go See someotherserver.otherdomain.com for  
> <recipient@otherdomain.com>
>
> Is such a redirection possible?
> Is it hard to configure?

Yes, it's possible, and no, it's fairly easy to configure.  You want:

FEATURE(redirect)

...if using sendmail, which does:

redirect        Reject all mail addressed to "address.REDIRECT" with
                 a ``551 User has moved; please try <address>'' message.
                 If this is set, you can alias people who have left
                 to their new address with ".REDIRECT" appended.

-- 
-Chuck