PHP Webmaster <[EMAIL PROTECTED]> wrote:
>
> Thank you for the great responses. Here are more
> information regarding my system:
>
> Dual P3-800
> 1 Gig ram
> RAID 5 with 4 10k rpm disks
This probably isn't good enough. If you're trying to push 6M individual
messages through the queue in significantly less than 24 hours, you
probably want a dedicated spindle for the queue -- and you want it to be
as fast as possible.
> The messages are about 10k a piece. They are personalized for each
> subscriber.
That's a horse of another colour. With a standard qmail install, this
requires queueing each of your 6M messages separately, which will put a
huge load on the queue disk. Russell Nelson sells a system which can be
made to overcome this limitation (qmail-verb?).
> (1) What is dnscache. Is it very important to use? Can anyone point me
> toward some good resources? We are currently am using our web hosting
> company's dns (cybercon - same company used by colonize.com). Will
> running dns cache mean we have to run bind on our own servers?
No, don't use bind. dnscache is part of djbdns, written by qmail's
author. It's a fast, secure DNS resolver.
> (2) I heard that some large mailing lists use QMQP. I read on
> qmail.org is capable of sending 1000 emails in 10 seconds over a
> modem. Is it really this powerful? Could I use it to send 6 million
> emails per day with one server using standard pc hardware (eg dual
> p3-800, 1 gig ram, raid 5)?
That figure is for delivering a single identical message to 1000
recipients. While QMQP might be slightly faster than SMTP for your
application, it requires that the receiving MTAs be capable of it. Very
few are.
Charles
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Charles Cazabon <[EMAIL PROTECTED]>
GPL'ed software available at: http://www.qcc.sk.ca/~charlesc/software/
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