* Hyper Text Transfer Protocol (HTTP)
* Internet Message Access Protocol version 4 (IMAP4)
* Network News Transfer Protocol (NNTP)
* Post Office Protocol version3 (POP3)
* Simple Mail Transfer Protocol (SMTP)
Hyper Text Transfer Protocol (HTTP)
HTTP uses Port 80 where information is sent in clear text. HTTPs (Secured) uses port 443, where all information is sent in encrypted format. HTTP is used for accessing mails through Outlook Web Access (OWA).
Internet Message Access Protocol version 4 (IMAP4)
IMAP is just POP3, but it provides a lot of functionality which is not included with POP3. A user can manipulate his mails and manage mailbox in many ways as if they were local.
IMAP also supports selective download feature where subscribe folders can only be downloaded to the client system. It will prevent clients for downloading the complete mailbox to a specific computer.
IMAP supports accessing multiple mailboxes and downloading any specific message.
IMAP4 does not send e-mails. SMTP provides this functionality with IMAP.
IMAP uses port 143
Network News Transfer Protocol (NNTP)
NNTP replaced the original Usenet protocol, Unix-to-Unix Copy Protocol (UUCP). It is used for publishing news on newsgroups.
It allows Microsoft Outlook users to participate in online discussions over the Internet.
Public Folders are represented as newsgroups in NNTP and users can read and post messages and documents to these newsgroups. Newsfeeds are used for replicating contents in newsgroups to Usenet computers.
NNTP works on Application layer of OSI model and uses TCP port 119. NNTP with SSL uses TCP port 563.
Post Office Protocol version3 (POP3)
POP3 is used for downloading mails from the mail server.POP3 uses TCP port 110.
POP3 is a client/server protocol, where POP3 server stores user emails. Clients download those mails to his system and those mails get deleted from POP3 server. Do not confuse yourself with SMTP and POP3/IMAP. SMTP is used to send mails, where as POP3 and IMAP is used for reading mails.
Simple Mail Transfer Protocol (SMTP)
SMTP is a Push protocol, used for sending mails from the mail client to mail server. It cannot be used to Pulls mails from the mail server.
SMTP uses TCP Port 25.
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