From: shawn D.Wang (shawn.d.wanggmail.com)
Date: Fri Aug 29 2008 - 02:20:18 CDT

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Ralf, thanks for the quick response.

Surely I will use multi recipients.
I supposed the postfix will send a separate copy to each recipient.
for instance$B!'(Bif i have two recipients, r1hotmail.com and r2yahoo.com, they
are in different ISP, so postfix will transfer two times, once for the
hotmail ISP, and another for the yahoo ISP. Am I right?
Or another way, optimisticly, I can only transfer one time, say, to
hotmail ISP, and the mail sever receive this mail then find there is another
recipent at yahoo ISP, so the hotmail mail sever on one hand, put the mail
to its user, and on the other hand, continue with the transfering to yahoo
ISP. But I believe the later one could never happen.

But if the two users are in the same ISP, how does the postfix transfer the
message? The postfix only transfer once? and the receiver ISP distribute two
copies separately two each user? is that mean, the for a message, the copy
number the postfix will transfer does not depend on the recipient number (of
course under the max recipient number limit), but depend on the ISP number
in all the recipients? say, if I have a message with 5 recipients:
johnhotmail.com, leehotmail.com, marrygmail.com, shawngmail.com,
kingyahoo.com, will the postfix only transfer 3 copies for the message?
That is the key point of my problem. if the answer is "yes", then I can use
multi recipients in the same message but transfer only one copy, that would
be so, so, good.

On 8/29/08, Ralf Hildebrandt <Ralf.Hildebrandtcharite.de> wrote:
>
> * shawn D.Wang <shawn.d.wanggmail.com>:
> > Hi guys:
> >
> > I'm fresh at postfix. Resently, we have built the postfix for our web
> > service. We would like to deliver some e-magzines to our registered
> users.
> > but the size of each magzine is over 1 M. but we have hundreds of
> thousands
> > users. As a result, the bandwidth is embarrassing.
>
> Yes.
>
> > Since most of our users use yahoo, Hotmail and some other huge ISP, so
> > if we can just send one copy to certain number of users of the same
> > ISP, the bandwidth could be saved a lot.
>
> Do you use single recipient or multi recipient mails?
>
> > just let the ISP themselves to distribute the mails to those users. Is
> > there some method to deal with this problem$B!)(Bor just some configuration
> > change can do$B!)(B
>
> Use multi recipient mails!
>
> --
> Ralf Hildebrandt (Ralf.Hildebrandtcharite.de)
> snickebocharite.de
> Postfix - Einrichtung, Betrieb und Wartung Tel. +49 (0)30-450 570-155
> http://www.arschkrebs.de I'm looking for a
> job
> Yes, and every single administrator that's configured their virus
> scanner to bounce to envelope deserves a swift kick upside the head.
>

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