Subject: Re: Mail list envelope sender address
To: Robert Black <>
From: Perry E. Metzger <>
List: current-users
Date: 11/12/1996 13:13:48
Robert Black writes:
> On Nov 11, 12:05pm, "Erik E. Fair" (Time Keeper) wrote:
> > Subject: Re: Mail list envelope sender address
> >
> > Qmail achieves its "low latency" goal by beating remote SMTP servers to
> > death - i.e. it shifts the delivery burden there by opening up multiple
> > SMTP connections to a given remote (one per recipient!), when it should not
> Well, actually, the way qmail achieves lower latency over sendmail is by
> opening multiple connections to *different* hosts at the same time.

No, this has been a big argument. Dan actually claims that opening
three connections to one machine and sending three copies of the same
message when you want to deliver the same message to three recipients
is somehow a performance win.

See the DRUMS archives for details.

> Unfortunately it can't handle multiple mails over the same connection so it
> does tend to open multiple connections to the same host as an unfortunate
> side-effect. If you want a mailer that will do parallel delivery of different
> hosts *and* multiple mails over a single connection then exim (version 0.57 o
> later) is worth taking a look at. I know of several people who are using it f
> high mail bandwidth sites including Sunsite Northern Europe
> ( who use it for ftpmail, and at least two sites using i
> in conjunction with majordomo.
> Cheers
> Rob Black
> PS Exim is also pretty friendly to configure.
> --