I'm not sure I fully understand what your trying to do, but would virtual
hosting suit your needs? I've recently set up my system to map
user@netbsd.box to user@isp.com for my outgoing mail on some of my local
accounts. It's far better than the alias file imho.

There is also the option of mapping incoming addresses but I haven't yet
found a use for this.

NOTE: This did require a new sendmail.cf file made from changed sources
but it wasn't the least bit challenging.

Ok now for me. :)  I'd like some information on just how MaileXchange
works. (MX records) Particularly how I could set up my machine to host
mail coming from another machine. Please don't refer me to the "Bat Book"
I do know about it I just don't have the urge to read it at the moment, I
will read it someday just not today. :)

TIA
tcjam

 On Thu, 16 Oct 1997, David A. Gatwood
wrote:

> 
> You're probably going to laugh, but... as an exercise in futility... I
> decided to set up my internet talker to handle, at least to some degree,
> incoming and outgoing internet email.  In that talker users don't have
> shell accounts, the current method is to place their actual internet email
> address in the from: field of outgoing messages.  Howver, now that I've
> hacked the parser code enough that it should handle unedited RFC-compliant
> email messages, I've decided to try to extend this to handle incoming mail
> as well.
> 
> I've come up with two schemes.  The first involves simply hand-adding
> users that rewuest internet mail reception to /etc/aliases, with mail
> piped to a special delivery program and add their names to another file to
> tell the talker to use username@globegate.utm.edu as their outgoing mail
> address instead of their internet address.  That's easy enough, but it's
> really pretty kludgy.  This could be simplified, I suppose, by having the
> talker parse /etc/aliases, but that's still kludgy.  What I'd really like
> to do is have sendmail check to see if the user is a real user first, and
> if so, deliver mail normally, otherwise go through all the rewriting rules
> but use a different delivery agent, which (upon failure, whether because
> it wasn't a user or the user didn't have mail permission) would generate
> an error message that would get passed back to the sender.  Does anyone
> have any idea how this could be done? 
> 
> Note that the delivery program itself is easy enough to write (complete
> with a mapping of talker-root to ROOT).  What I'm trying to figure out is
> the sendmail.cf changes....  :-)
> 
> 
> TIA,
> David
> 
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>