What happens if you try pinging the server? ie.
ping kay.blacknight.ie
I can confirm that the server is listening for pop3 connections:
Code:
telnet kay.blacknight.ie 110
Trying 81.17.248.21...
Connected to kay.blacknight.ie.
Escape character is '^]'.
+OK POP3 server ready <484f0644-727d-4d28-8906-39dd89af5eac>