We have a CentOS 6.7 server using Exim w/ Cpanel that usually sends spam. We need to properly configure it to decrease spam.
Server is being blacklisted because our user's passwords are often stolen with drive-by exploits, Windows malware, phishing...
99.99% of the times spam emails have their from parameter changed to some random account name, and we get the real one by checking the auth id out from headers. Then we just change account's password and reboot exim.
We need a much better configuration via ACLs/IP filtering or whatever it's needed to fix this situation.
We are looking for a person who can handle this fast doing a good job.
Some useful data:
Exim version 4.85
All our customers' are Spain based