> How? 500,000 separate messages or one message with 500,000 recipients?
> If the former, have you tried stopping qmail-send until the messages
> are injected--and do you really need to send each recipient a
> different message?

They are seperate messages and Yes it's needed because those are
personalized e-Mails!

> >Why are there just average of 4 concurrent qmail-remote Processes ?
> >How to improve it ?
>
> What else is the system doing beside sending your mails?

Beeing failover Apache Webserver. But Main Job is Mailserver!

> What kind of
> disk is the queue on?

SCSI Disk (SUN UFS)

> What is your network connectivity?

10 MBit Internet Connection.
Lan is 100 MBit.

> What is the
> mean airspeed velocity of an unladen swallow?

Dunno, gonna search on Google! :-)

> -Dave

--
Michael..

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