==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.8.7
- Linux/BSD distribution name and version: Ubuntu 14.04.1 LTS (GNU/Linux 3.13.0-24-generic x86_64)
- Store mail accounts in: MySQL
- Web server: Apache
- Manage mail accounts with iRedAdmin-Pro? Yes
====
There is a high load average on the mail server, all the time, this makes mail delivery slow taking from 40 minutes to up to 2 hours, even withing the same mail server.
Disabling spam assasin and amavis is not an option, because people complain about how much spam they got.
This machine has 4 cores and 8gb of RAM, so the mail server is really hungry, even with tiny amouts of mails inside (200 mails is enough to just freeze the server)