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From: Karl Kleinpaste <karl@justresearch.com>
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Subject: Re: Splitting, crossposts, duplicates, the universe, and everything.
Date: 17 Nov 1998 18:40:18 -0500
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Lloyd Zusman <ljz@asfast.com> writes:
>     To: one@asfast.com, two@asfast.com, three@asfast.com, four@asfast.com
> This causes 4 separate messages to be sent out

It certainly should not.  RFC 821, page 3:

   When the same message is sent to multiple recipients the SMTP
   encourages the transmission of only one copy of the data for all the
   recipients at the same destination host.

If you are suffering under an MTA which stupidly generates distinct
SMTP sessions for a single message addressed to multiple recipients at
a single destination, get a new one.  Sheesh, talk about trivial
optimizations..."Don't send it more times than absolutely necessary."