Instructions for adding your email account can be found here
http://support.mozillamessaging.com/en-US/kb/manual-account-configuration?s=add+account&as=s
Ensure that you select the following options during account setup
Non SSL Settings
Incoming Server POP3
Server Hostname: mail.yourdomainname e.g mail.testdomain.com.au
Port 110
Use SSL No
Authentication Password
Outgoing Server SMTP
Server Hostname: mail.yourdomainname e.g mail.testdomain.com.au
Port 587
Use SSL No
Authentication Password
SSL Settings
Incoming Server POP3
Server Hostname: mail.yourdomainname e.g mail.testdomain.com.au
Port 995
Use SSL Yes
Authentication Password
Outgoing Server SMTP
Server Hostname: mail.yourdomainname e.g mail.testdomain.com.au
Port 465
Use SSL Yes
Authentication Password
IMAP Settings
Incoming Server IMAP
Server Hostname: mail.yourdomainname e.g mail.testdomain.com.au
Port 993
Use SSL Yes
Authentication Password
Outgoing Server SMTP
Server Hostname: mail.yourdomainname e.g mail.testdomain.com.au
Port 465
Use SSL Yes
Authentication Password
Non SSL Settings
Incoming Server IMAP
Server Hostname: mail.yourdomainname e.g mail.testdomain.com.au
Port 143
Use SSL No
Authentication Password
Outgoing Server SMTP
Server Hostname: mail.yourdomainname e.g mail.testdomain.com.au
Port 587
Use SSL No
Authentication Password
You should also ensure not to leave a copy of messages on the server for any more than 7 days.
