Qmail hangs on external connections

I'm installing a new server (CentOS4), and most of it is done. I was under the impression that even Qmail works as expected, until I noticed I wasn't getting any email from outside the server. Locally it works fine. Email from one local user to another works fine. I've done testing with Telnet sessions to port 25. Locally, again, it responds all happy and everything is just fine.
But when I start a telnet session to port 25 from my home pc, it makes a connection, and then just "hangs", nothing happens...

I've tried with my firewall down, but that's not the problem. I've checked file permissions/ownership as much as I could, but that's not clear as Qmail uses half a dozen accounts

Two questions here:
Anyone have a clue why external connections to port 25 end up hanging in nothingness?

Where oh where can I find info about file permissions and ownerships and such for Qmail related stuff?

 

 

 

 

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