McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 22 Simple Mail Transfer Protocol (SMTP)

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 CONTENTS USER AGENT (UA) ADDRESSES DELAYED DELIVERY ALIASES MAIL TRANSFER AGENT (MTA) COMMANDS AND RESPONSES MAIL TRANSFER PHASES MIME MAIL DELIVERY MAIL ACCESS PROTOCOLS

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure 22-1 SMTP concept

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure 22-2 UAs and MTAs

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure 22-3 Relay MTAs

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure 22-4 Mail gateway

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 USER AGENT (UA) 22.1

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure 22-5 Format

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 ADDRESSES 22.2

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure 22-6 Address

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 DELAYED DELIVERY 22.3

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure 22-7 Sender-site delay

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure 22-8 Receiver-site delay

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 ALIASES 22.4

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure 22-9 Alias expansion

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure One-to-many expansion

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure Many-to-one expansion

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 MAIL TRANSFER AGENT 22.5

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure system

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 COMMANDS AND RESPONSES 22.6

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure Commands and responses

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure Command format

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 MAIL TRANSFER PHASES 22.7

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure Connection establishment

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure Message transfer

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure Connection termination

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 MULTIPURPOSE INTERNET MAIL EXTENSIONS (MIME) 22.8

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure MIME

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure MIME header

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure Base64

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure Quoted-printable

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 MAIL DELIVERY 22.9

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure delivery

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 MAIL ACCESS PROTOCOLS 22.10

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Figure POP3