qmail not recieving mail

[Barley]

Hi all,

Im totally new to qmail, so please forgive my lack of knowledge. I seem to
have pop3 set up on my server now. I can log in via telnet etc. The thing
is, it seems qmail is not recieving incoming mail properly. Could someone
give me a checklist of how to track how far the mail makes it and where it
goes wrong?

In other words, I want to know if it makes it to the server and then if
qmail handles it correctly or where the problem may be. Thanks in advance.

Gregg