The way I do it is (and if you have access to the primary DNS for
name.com), add an entry for the mail server for machine.name.com

in named.boot file:
primary        name.com       192.0.1.1 (or whatever)
primary        machine.name.com    192.0.0.2 (ditto)

in machine.name.com file
$ORIGIN name.com.
machine   in   soa  ns.name.com. dns.name.com.
     etc, etc,
          in   mx   5 mail.machine.name.com.
mail      in   a    [your mail server's ip address a.b.c.d]

Regards,
Kevin






johnam@mail.kemper.org on 12/02/97 10:15:37 AM

To:   netbsd-help@NetBSD.ORG
cc:    (bcc: Kevin Tsang)
Subject:  sendmail forwarding messages




I want to set sendmail up as a mail gateway.
I have several Email systems for different groups and I want to be able to
tell everyone to set there email up as user@name.com though their real
email may be user@machine.name.com.
Basically the way if see it working is:
1) If someone sending email knows their real email address
(user@machine.name.com) or is replying to a message, everything will work
the same.
2) When I add an account to a 2ndary machine I want to be able to just tell
them that their email is user@name.com.
So what will happen if an Email gets sent to the primary email machine and
the user is unknown, it will pass it on to Email system2, which will try to
find a home for it, if the user is unknown, pass it on to system3 and so
forth until it gets to a terminal (end) email system which will send the
sender a no such user email.
Now to do this, would each machine have to re-hash the To: address before
sending it on?