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POP is a protocol for e-mail storage. SMTP is a protocol for sending and receiving.
Pop: Post Protocol
Smtp: Simple Mail Transfer Protocol
SMTP is a relatively simple, text-based protocol, in which one or more recipients of a message are specified (and in most cases verified to exist) along with the message text and possibly other encoded objects. The message is then transferred to a remote server using a procedure of queries and responses between the client and server. POP is a very simple protocol that only allows downloading of messages from your Inbox to your local computer. Generally, once transferred, the email is then on your local computer and is removed from FastMail.FM. IMAP is a much more advanced protocol that allows you to see all your folders on FastMail.FM, and quickly view subjects and message bodies of emails, but delay downloading of larger emails (such as those with attachments) to a later time if you want. IMAP also allows you to synchronise mail folders between your home machine and FastMail.FM on the web, so that you see the same folders and messages wherever and however you access your email.
POP3 protocol is used to Receive mail and SMTP protocol is used to send email.
POP3 is an Old fashion of receiving email and it is not secure also it suggest you to use Exchange Email Account .