In 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.  POP version 3 ( POP3 ) is the version in common use.
POPmail was an early e-mail client written at the University of Minnesota. The original version was a Hypercard stack that acted as a Post Office Protocol client. Later versions of POPmail were written as normal Macintosh applications, and a PC version of POPmail was also released.
- Current, aerc, Alpine, Balsa, Citadel/UX, Claws Mail, Cleancode eMail, Cone, Evolution, fetchmail, fdm, Geary, getmail, GNUMail, Gnus, Gnuzilla, IMP, KMail, Mahogany, Mailpile, Mailx, Mailx (Heirloom Project), Modest, Mozilla Thunderbird, Mulberry, Mutt, nmh / MH, OfflineIMAP, Roundcube, SeaMonkey, SquirrelMail, Sylpheed, Trojitá, YAM, Zimbra, Discontinued, Arachne, Beonex Communicator, BlitzMail, Classilla, Columbia MM, Elm, FossaMail, Hula, Mailody, Mozilla Mail & Newsgroups, Nylas N1, Spicebird
- Extended SMTP, IMAP, JMAP, LMTP, POP, Push-IMAP, SMAP, SMTP, UUCP
- Freeware, eM Client, EmailTray, Foxmail, i.Scribe, Mailbird, Opera Mail, Spark, Spike, TouchMail, Retail, Hiri, Bloomba/WordPerfect Mail, Newton, IBM Notes, InScribe, Apple Mail, Mail (Windows), Microsoft Outlook, Novell GroupWise, Airmail, Postbox, Shareware, Becky!, Forté Agent, GyazMail, The Bat!, Donationware, Pegasus Mail, Discontinued, cc:Mail, Claris Emailer, Courier, Cyberdog, Cyberjack, Embrowser, Eudora (discontinued in 2010, moved to open-source in 2018), Mailbox, Microsoft Entourage, Microsoft Internet Mail and News, Microsoft Mail, MINUET, Netscape Mail, Netscape Messenger 9, NeXTMail, Outlook Express, Pine, Pocomail, POPmail, Sparrow, Turnpike, WebSpyder, Windows Live Mail, Windows Mail, Windows Messaging
- Email, Unicode and email, Premium email
The Post Office Protocol 3 (POP3) is a mail access protocol used by a client application to read messages from the mail server. Received messages are often deleted from the server . POP supports simple download-and-delete requirements for access to remote mailboxes (termed maildrop in the POP RFC's). 
Package on package, IC packaging; Point of presence, a demarcation point between communicating entities; POP and POP3, Internet e-mail Post Office Protocols; Pop! OS, a Linux distribution. Other uses in science and technology. Pop (physics), sixth derivative of position; Parallel Ocean Program, an ocean circulation model; Paroxypropione, P.O.P.
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Users can access Gmail on the web and using third-party programs that synchronize email content through POP or IMAP protocols. Gmail started as a limited beta release on April 1, 2004 and ended its testing phase on July 7, 2009. By 2018, Gmail had 1.5 billion active users worldwide.
Email clients using IMAP generally leave messages on the server until the user explicitly deletes them. This and other characteristics of IMAP operation allow multiple clients to manage the same mailbox. Most email clients support IMAP in addition to Post Office Protocol (POP) to retrieve messages. IMAP offers access to the mail storage.
The Simple Mail Transfer Protocol (SMTP) is a communication protocol for electronic mail transmission. As an Internet standard, SMTP was first defined in 1982 by RFC 821, and updated in 2008 by RFC 5321 to Extended SMTP additions, which is the protocol variety in widespread use today.
Aug 23, 2017 · POP3 is the current version of this particular style of email protocol, and still remains one of the most popular email protocols. POP4 has been proposed, and may be developed one day, although there’s not been much progress in several years.
Aug 06, 2015 · In simple terms, POP and IMAP determine how your incoming mail is moved, saved, deleted and synchronized between the email server and your inbox. POP moves email from the server to your device (PC ...