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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. [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.
IMAP (Internet Messaging Access Protocol) • Emails are stored on the server. • Sent messages are stored on the server. • Messages can be synced and accessed across multiple devices. POP3 (Post Office Protocol) • Emails are stored on a single device. • Sent messages are stored on a single device.
Virtually all modern e-mail clients and servers support IMAP, which along with the earlier POP3 (Post Office Protocol) are the two most prevalent standard protocols for email retrieval. [4] Many webmail service providers such as Gmail and Outlook.com also provide support for both IMAP and POP3.
Mail is retrieved by end-user applications, called email clients, using Internet Message Access Protocol (IMAP), a protocol that both facilitates access to mail and manages stored mail, or the Post Office Protocol (POP) which typically uses the traditional mbox mail file format or a proprietary system such as Microsoft Exchange/Outlook or Lotus ...
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). [ 65 ]
The Post Office is also empowered to construct or designate post offices with the implied authority to carry, deliver, and regulate the mail of the United States as a whole. The Postal Power also includes the power to designate certain materials as non-mailable, and to pass statutes criminalizing abuses of the postal system (such as mail fraud ...
Common protocols for this are: Post Office Protocol (POP3) Internet Message Access Protocol (IMAP) Proprietary systems, such as Microsoft's MAPI; Submission of new email from a mail client is via SMTP, typically on port 587 or 465, and is now generally restricted to servers the user has an account with-such as their ISP.
Post Office Protocol - Version 3: May 1996: POP v 3: RFC 1945 : Hypertext Transfer Protocol—HTTP/1.0: May 1996: HTTP v 1.0: RFC 1948 : Defending Against Sequence Number Attacks: May 1996: IP spoofing: RFC 1950 : ZLIB Compressed Data Format Specification version 3.3: May 1996: Zlib v 3.3: RFC 1951 : DEFLATE Compressed Data Format Specification ...