I turned off TLS and tried to connect via SquirrelMail, and I had success. I also, managed to configure the Outlook to access mailbox via POP protocol. It seems that port 25 is not accessible outside of the localhost (i have to figure out how to turn it on).
Also, IMAP is working on localhost but not visible on the outside. Once I manage to turn these porst on, I'll try to turn back to TLS step by step...