Verify email setup
I went through the tutorial here on howtoforge for setting up the perfect ubuntu dapper server. I then installed ISPConfig. Everything with ISPConfig seems to be working fine, except for email. I have deployed four sites using ISPConfig and have created email users for each, but I still can't login to my POP3 server using the accounts ISPConfig created.
Where do I need to look to begin troubleshooting?