[UUG/MLUG] Hacking sendmail for home system over dial-up

["Rich Tollerton;;" <EMAIL:PROTECTED>]

I suppose others have solved this problem here, so I'll ask it here. I
don't have a copy of the sendmail book on hand right now, and I probably
won't on campus for a couple days to get it from somebody else, or else I
probably would figure this out myself :)

  I've started using mutt as my email client on my home Linux box. Really
fast, clean design, great PGP integration, no SMTP support to send mail to
another host (grr) like Pine has. Thus mutt will use sendmail (on the
same system) to send mail instead of using my ISP's sendmail. 

  Now, the hostname on this system (tres.tranquility.net) doesn't exist,
so 99% of the remote mail servers on the Internet won't accept mail from
my server. (Oddly, Tranquility's server DOES accept my mail, although
that's not really relevant to the problem.) So if mutt will only use a
local sendmail, and that sendmail must connect directly to Internet mail
servers, then that sendmail must also forge a hostname. If I force the
hostname to tranquility.net (Dj variable in sendmail.cf), all Internet
servers will accept my mail OK.  But if I try to send mail to another
Tranquility account, sendmail thinks I'm sending the message to a user on
this same home computer, can't find that user, and complains loudly. So
forcing sendmail's hostname doesn't work. I suppose relaying all the mail
from this computer's sendmail to Tranquility's sendmail would work, but I
really don't know how to do that (like I said, no book). Haven't looked at
other MTAs yet. 

In short, if my sendmail is to actually deliver my mail, this is what has
to happen to the (perceived) hostname given to other sites:
Mail to localhost and Tranquility: Hostname stays the same
         (tres.tranquility.net)
Mail to the rest of the Internet: Hostname is changed (tranquility.net)

Headers that have invalid addresses are not an issue, they can be forged
in mutt, although it would be great if sendmail could handle conversion on
the fly (EMAIL:PROTECTED -> EMAIL:PROTECTED).

I'd appreciate it if somebody else knows how to make sendmail act like
this, and I suppose others would too (I know using mutt on dial-up can't
be an isolated case...) 

___
Rich Tollerton
EMAIL:PROTECTED
EMAIL:PROTECTED
EMAIL:PROTECTED