My server send spam.

==== Required information ====
- iRedMail version: iRedMail-0.8.7
- Mysql:
- Ubuntu 14.04:
- Related log if you're reporting an issue:
====

Hi.

i would like know if u can helme with the next problem:

i have my mail server and i have been reported in  differents black list for to send spam. i can look into about that and knew that my clients (windows with outlook) were in a botnet called "cutwail".

i would like to know who is in this botnet because i have 130 clients and i cant format 130 windows stations.

Is there a way to check the outgoing spam? And do you identify infected clients?.

Please help me.

PD:  Sorry for my english.