Re: [exim] exim capabilities fo 10-30 K email accounts

On Tue, Nov 16, 2004 at 02:51:00PM -0600, JupiterHost.Net wrote:
> Hello Again group :)
>
> Thank you very much for all your insight it has been very useful and
> appreciated

We're doing a system for 30-45K users and the metrics needed to design it
were things like volume of mail per hour, number of mails, user connection
method and profile (POP, IMAP, web mail), mail size distribution,

The key is to know your software. IMAP is likely to have more of a
performance impact than the SMTP side. Although spamassassin uses
significant resources compared to plain mail delivery or virus scanning.
Different IMAP servers have different resource requirements and some decent
testing and experimenting with things like filesystem types, disk layouts
and tuning parameters could achieve considerable performance gains.

Separating your web server from your mail servers might help. Running
your AV and SA on other servers could help. Look at trying to use persistent
IMAP connections and local DNS caches.

The more time you can spend testing the better really.

Mike
--
Mike Richardson
Messaging and Collaboration
Manchester Computing
Email: mike.richardson@???
*Plain text only please - attachments stripped on arrival*