First of all, thank you for trying to help me. It's like you're the only one who wants to help me atm (posted this issue on 3 other forums and nobody responds).
So I tried your commands, and at the first one I can see tha smtp, imaps, imap, pop3 and pop3s are running.
Output for netstat -tap
Output for iptables -L
PS: I couldn't paste it here on the forum, got the error that the message was too short but I guess it was too long.
And again, thanks for helping me. I hope we'll fix it soon.