WEBPush email is an email system that provides an always-on capability, in which when new email arrives at the mail delivery agent (MDA) (commonly called mail server), it is immediately, actively transferred by the MDA to the
WEBIn computing, the Post Office Protocol ( POP) is an application-layer Internet standard protocol used by e-mail clients to retrieve e-mail from a mail server. [1] Today, POP version 3 ( POP3) is the most commonly used version. Together with IMAP, it is one of the most common protocols for email retrieval.