SMTP routing based on From: address?

[Grant Edwards]

It's sort of an odd request, but I'd like to route outgoing mail to one of
two SMTP servers, but I don't want to do it based on the destination
address.  I would like to do it based on the From: address in the header.

OK, so I probably can't do that.

Alternatively, is there any way I could use two different "sendmail"
binaries/wrappers to pre-determine which SMTP server the mail is routed to?

-- 
Grant Edwards
[EMAIL PROTECTED]