What is SMTP?
SMTP - Simple Mail Transport Protocol.
SMTP is the main method by which outgoing email is sent.
SMTP operates (by default) on TCP/IP port 25.
For a more detailed specification see RFC2821.
July 24, 2004
July 23, 2004
What is IMAP4?
IMAP4 - Internet Messsage Access Protocol (version 4). It is more commonly known as just 'IMAP' and was formerly known as 'Interactive Mail Access Protocol'.
IMAP is mainly designed for permanent connection (although it can also support disconnected operation).
IMAP runs by default on TCP/IP port 143.
For a more detailed specification see RFC3501.
July 22, 2004
What is POP3?
POP3 is short for Post Office Protocol version 3.
This is used for incoming mail to retrieve email from a mail server.
POP3 is mainly designed for disconnected operation and welll suited to both permanent (broadband) and dialup connections.
POP3 runs by default on TCP/IP port 110.
For a more detailed specification see RFC1939.
July 21, 2004
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