Routing based on message size is possible via sendmail.cf changes and it
is not too complicated to implement.
I have posted here (*long* time ago) recipes how to do it but google
shows posts with "dead" link to dejanews [google "forgotten" the
referenced article].
AFAIR the only really tricky part in implementing routing based on
${msg_size} and arith map was to avoid "at once" delivery attempts
[ e.g. by using "expensive" flag in mailers] because ${msg_size}
was not reliable for in "at once routing" (before message body is
fully transmitted).
--
[pl>en Andrew] Andrzej Adam Filip : an...@onet.eu : Andrze...@gmail.com
Open-Sendmail: http://open-sendmail.sourceforge.net/
Paradise is exactly like where you are right now ... only much, much better.
-- Laurie Anderson