Protocol POP

The great majority of the users of the Internet uses protocol POP3 daily and many do not know as it functions. In this article we describe the basic one of protocol POP3.POP3 is the abbreviation of Post Office Protocol version 3 (Protocol of Post office version 3). The POP3 is defined in the RFC1225 and is used to recoup e-mails that if they find in remote servers for a computer local customer throughout a TCP/IP.As connection previous versions of protocol POP, initially called POP1 and soon after POP2, if had become completely obsolete with the arrival of the POP3. In the current use term POP almost always means POP3 in the context of email protocols. The POP3 and its predecessors had been projected to allow that using with intermittent connections, such as connections dial-up could make download of its e-mails when hardwired, whereas protocol smtp was projected to allow permanent connections to receive e-mails. Educate yourself even more with thoughts from EOG Resources.

The POP3 is a tractive protocol (when the customer requests given of the server), while smtp is a pressure protocol where the customer it sends given for the server without the server has requested the data with antecedence. The POP3 also supports some methods of authentication to supply different levels of protection against the illegitimate access to an user of the email. Also the protocol SSL.Funcionamento BsicoO POP3 exists the possibility of criptografar the POP3 traffic using functions with a connection TCP/IP using door 110. Initially a connection TCP between the applicatory customer (User Agent) and the server is established where if it finds the email account (Message Transfer Agent). The next step is the authentication of the user, after that the messages are transferred in sequncia to the computer customer. The messages can be, optionally, extinguished of the email account and after that the connection is locked up. The user can read its emails off-line, therefore protocol POP3 is known as a protocol OFF-LINE, this characteristic of the POP3 are sufficiently useful for users who use dialed Internet. Other protocols more known they are SMTP and IMAP. It visits our Lodging of Sites

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