What do you understand about ports? Email access is through standard ports be it throught POP3:110, IMAP:143, HTTPS:443 etc, that's the convention, unless the sysadmins alter them purposely which is rare.
So if you can download emails from other email hosts which I can through Telinet, then I don't see the reason for Telikom to open up a port for Datec's emails. Are they using a different Port Number? That would be unlikely. Like I said before, it's Datec that is denying requests for mail access through Telinet.
So please Digicel Rulz, you need to understand some technicalities before you post crap in here. Maski konim ol viewing public here.