==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.6
- Linux/BSD distribution name and version: CentOS release 6.9 (Final)
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Web server (Apache or Nginx): Apache
- Manage mail accounts with iRedAdmin-Pro?: Yes
- Related log if you're reporting an issue:
====

Since we have upgraded our server from 0.8.6 to 0.9.6, we are experiencing a lot of issues including the following:
    1. Spam have been increased tremendously while on the old version we did not experienced such a problem.
    2. We are struggling with the issue of connectivity such that some of the machines are able to connect to the server using outlook while the rest are not able, moreover some are connecting using TLS while the others are failing thus able to connect using SSL, and this is a most crucial problem that needs an immediate attention.

We are not sure as to where we did a mistake when upgrading but it is giving us a lot of problems, what are we supposed to do in order to fix the mentioned problems?