UCS Mailserver not receiving any mails in OX inbox

hi there,

I am trying to set up a mail server and i came pretty far but I cant receive mail in my OX inbox.
I did everything:
-opened ports
-MX entry
-Mailserver installed
-OX installed
-User is created, mail is created and I am able to send mails but I cant receive them
I have no clue what it could be, I tried reading the logs but I really dont understand anything. (There is a reason why I took my username)
I tried every soloution that worked for other in this forum nothing working…

What is weird that i can connect via telnet to my mailserver…