1. What is the function of SMTP?
The TCP/IP
protocol supports electronic mail on the Internet is called Simple Mail
Transfer (SMTP). It is a system for sending messages to other computer users
based
on e-mail addresses. SMTP
provides mail exchange between users on the same or different computers.
2. What is the difference between a user agent (UA) and a mail transfer
agent (MTA)?
The
UA prepares the message, creates the envelope, and puts the message in the
envelope. The MTA transfers the mail across the Internet.
3. How does MIME enhance SMTP?
MIME
is a supplementary protocol that allows non-ASCII data to be sent through SMTP.
MIME transforms non-ASCII data at the sender site to NVT ASCII data and
deliverers it to the client SMTP to be sent through the Internet. The server
SMTP at the receiving side receives the NVT ASCII data and delivers it to MIME
to be transformed back to the original data.
4. Why is an application such as POP needed for electronic messaging?
Workstations
interact with the SMTP host, which receives the mail on behalf of every host in
the organization, to retrieve messages by using a client-server protocol such
as Post Office Protocol, version 3(POP3). Although POP3 is used to download
messages from the server, the SMTP client still needed on the desktop to
forward messages from the workstation user to its SMTP mail server.
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