IMAP Wildlife problems ....

[Ben Duncan]

No, not that kinda wildlife. This involves one of my clients,
the MS Department of Wildlife Fisheries and Parks.

We are having IMAP services bringing their Mail server to
it's knees.

Server: Dell Dual Xenon 3.2 Rack mount server with 4GB main
memory , dual 1000 ethernet NICS, and close to 1TB of SCSI
320 RAID.

OS: Slack 10.2 with kernel 2.6.18 Sendmail version that was
the most recent as of March of this year along with
UW's Imap4Rev1. We use IMAP only as the server and no POP.

We have about 1200 subscribers and the breakdown is thus:
60% of the users have 15Mb and less in their inbox.
20% Of the users have 15Mb+ - 100Mb in their inbox
10% of the users have 100Mb+ - 400Mb in their inbox
5%  of the users have 400Mb+ - 1GB in their inbox
5%  of the users have 1GB+ in their inbox.

Seems everyone in the LARGE (100Mb+) inbox likes having
their MS OUTHOUSE check the inbox every 30 or so seconds. This seems
to be killing the machine.

Anyway, we are thinking about switching from UW Imap and maybe
going to Cyrus (or maybe even Courier / DoveCot).

We prolly will be implementing Quota's on InBox size as well..

Any suggestion? Pro's / Con's on IMAP servers?
Should we go to Cyrus ? Should we switch to Courier?
Do we need to go on to a PC shooting rampage ?

Thanks ...


-- 
Ben Duncan   - Business Network Solutions, Inc. 336 Elton Road  Jackson MS, 39212
"Never attribute to malice, that which can be adequately explained by stupidity"
        - Hanlon's Razor