Please remember that you may want to use Webmail, instead of POP3/SMTP/IMAP protocols.
Webmail (or Web-based e-mail) is an e-mail service intended to be primarily accessed via a web browser, as opposed to through a desktop e-mail client (such as Microsoft Outlook, Mozilla's Thunderbird, or Apple Inc.'s Mail).
A major advantage of webmail over application-based e-mail is that a user has the ability to access their inbox from any Internet-connected computer around the world. However, the need for Internet access is also a drawback, in that one cannot access old messages when not connected to the Internet.
on Linux hosting: http://yourdomain.com:2095 or https://yourdomain.com:2096 or http://yourdomain.com/webmail/