EGCP-4310 - Exam 1 - 08 E-mail and SMTP

What are e-mail system's main components?

User agents, servers, SMTP

What is a user agent?

Program for reading and composing mail

Where do incoming e-mails reside?

Recipient mailbox on mail server

Where do outgoing e-mails wait?

Mail server message queue

What protocol transfers mail between servers?

Simple Mail Transfer Protocol

What transport protocol does SMTP use?

TCP

What SMTP port does the textbook use?

Port 25

Which mail server acts as SMTP client?

The sending mail server

What are SMTP's three phases?

Handshake, message transfer, closure

What command introduces SMTP client?

HELO

What SMTP command names the sender?

MAIL FROM

What SMTP command names the recipient?

RCPT TO

What SMTP command starts message content?

DATA

What terminates SMTP message data?

CRLF dot CRLF

What character format does SMTP require?

Seven-bit ASCII

How does SMTP normally transfer e-mail?

Directly between sending and receiving servers

Is SMTP a push or pull protocol?

Push protocol

What retrieves mail from a server?

IMAP or HTTP

What does IMAP manage on server?

Messages, folders, and deletion

Which e-mail standard defines message syntax?

RFC 2822

How do SMTP commands differ from headers?

Commands transfer; headers describe message