Email protocols are defined by a set of standards which allow email software on different platforms and from different vendors to communicate between each other. VPOP3 supports all the major email protocol standards (IMAP4 is only supported in VPOP3 Enterprise).

•POP3 - basic email protocol to allow downloading mail from an email server to a client

•SMTP - email protocol for sending mail from an email client to a server or between email servers.

•IMAP4 - feature-rich email protocol to allow storing of mail on an email server with the client synchronising with the server

•Webmail - to access email via a web browser (not really an email protocol)

•SSL/TLS - a layer on top of POP3/SMTP/IMAP4 to support server verification and encryption of email protocol sessions.