>With some custom code tweaks (not yet released to the public, but look >out for them) and adequate RAM and network speed, I've actually stayed >stable with MaxQueProcs as high as 200. Don't try that on a plain >system, though.
I've built custom FreeBSD kernels with maxusers 128 which gives 2048 max processes. In that machine, I've set max SMTP processes to 400, and max SMTPD processes to 400. The multi-month DoS attack the Imail user was trying do defend against with IMgate consumed all 400 SMTPD processes, pegged out. valid incoming mail to the IMGate MX box could not obtain a free SMTPD process and was typically delayed 5 or 6 hours. It's very frightening to see that level of incoming DoS mail from 1000's of open-relays around the world. Although IMGate was rejecting all it as being in RBL servers, IMGate ran out of 400 processes doing the rejecting. Len http://MenAndMice.com/DNS-training http://BIND8NT.MEIway.com : ISC BIND for NT4 & W2K http://IMGate.MEIway.com : Build free, hi-perf, anti-abuse mail gateways Please visit http://www.ipswitch.com/support/mailing-lists.html to be removed from this list. An Archive of this list is available at: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/
