POP

Post Office Protocol (POP) is one of the most common forms of internet email.  Emails are received by a mail server on the internet and are stored until the user logs on and downloads them to the local client PC. Once downloaded, emails are normally deleted from the server, but can be left on it for a specified number of days by a setting in the email client.

Sent mail items are stored locally and not in the POP mailbox on the server.

Typical email client programs include Outlook, Outlook Express, and Thunderbird.