This definitely is not LINUX-net stuff, but rather about one
network application known as "SMTP", and systems implementing it..
On Mon, Aug 30, 1999 at 11:07:47AM +0200, Bobo Rajec wrote:
> Sendmail does this, sure. I recently got interested in how many times
> goes the same message over the wire, because we send lots of mail to
> many recipients. What I saw on the wire led me to believe that qmail
> delivers a message to one recipient only. Which is a bit unfortunate,
> because qmail runs our internet mail proxy and I do not dare to run
> sendmail on it.
Indeed that is its habit -- which also claims "fast" title
to it -- as long as the traffic isn't large compared to your
network pipe, or you don't have other constraints...
> What about the other MTAs ?
>
> qmail - (delivers to one recipient only, I think)
> exim - ?
> smail - ?
> postfix - ?
I know only one:
zmailer - One delivery for all recipients per destination domain.
Multiple domains served by the same box will get separate
deliveries, though.
I think all systems beside of qmail will deliver all recipients
for a message to same destination domain in one transaction.
Some systems are also able to detect case, where two totally
different domains are served by same server(s), and deliver
thus multiple domains in same transaction.
Most, if not all, are configurable to punt all non-local email
to e.g. an ISP email relay for outbound delivery, and of those,
most (if not all) will then deliver all receipients in the message
which your relay MTA gets in one transaction to that ISP relay.
One particular installation I know of runs ZMailers as email
gateway over a long delay satellite pipe, and there several
advaced SMTP protocol enhancements help ZMailers to get more
email throughput from the pipe, than classical half-duplex SMTP
systems can. (I mean ESMTP features: PIPELINING, and CHUNKING)
Even qmail claims to be compliant with PIPELINING at the server
side, but to my knowledge its smtp client code does not do it,
thus it behaves as good citizen for reception, but can not take
the advantage at the transmission -- and sendmail does not even
claim compliance at the reception...
> regards,
> bobo
/Matti Aarnio <[EMAIL PROTECTED]>
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