Page 25 - CA 165 ver 1.0 Class 10
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POP


                 POP stands for Post Office Protocol. It is generally used to support a single client. There are several
                 versions of POP but POP3 is the current standard version.


                                                                                                 Recipient e-Mail Server
                      MTA/e-Mail Client
                                                             SMTP



                                                                                              POP3 or IMAP



                              SMTP













                 Post Office Protocol version 3 (POP3) is a standard mail protocol that is used to receive emails from a
                 remote server to a local email client. It works similar to the physical version of a post office clerk, POP3
                 receives and holds email for an individual until delivered. POP3 allows you to download email messages
                 on your local computer and thus enables you to read them offline too. By default, the POP3 protocol
                 works on two ports:
                   Port 110: Non-encrypted POP3 port

                   Port 995: Encrypted POP3 port

                 IMAP

                 Internet Message Access Protocol (IMAP) is a mail protocol that enables to receive emails from a remote
                 server to a local email client. It allows to access e-mail messages without downloading them.
                 The advantage of using an IMAP mail server is that users can check their mail from multiple computers
                 and always see the same messages. This is because the messages stay on the server until the user chooses
                 to download them to his or her local drive. Most webmail systems are IMAP based, which allows people
                 to access both their sent and received messages no matter what computer they use to check their mail.

                 By default, the IMAP protocol works on two ports:
                   Port 143: Non-encrypted IMAP port

                   Port 993: Encrypted IMAP port

                      Do you know?

                      IMAP was originally known as the Interactive Mail Access Protocol. The name was changed to Internet
                      Message Access Protocol in IMAP4 version.




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