What is the difference between SMTP and HTTP?

Answer 1

SMPT uses Port No 25

HTTP uses Port No 80

Answer 2

There are three main differences between HTTP and SMTP:

1) HTTP is mainly a pull protocol--someone loads information on a web server and users use HTTP to pull the information from the server. On the other hand, SMTP is primarily a push protocol--the sending mail server pushes the file to receiving mail server.

2) SMTP requires each message, including the body of each message, to be in seven-bit ASCII format. If the message contains binary data, then the message has to be encoded into seven-bit ASCII format. HTTP does not have this restriction.

3) HTTP encapsulate each object of message in its own response message while SMTP places all of the message's objects into one message.

--Nitin, CAIR, Bangalore