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This chapter delves into the intricacies of the Simple Mail Transfer Protocol (SMTP), covering essential components such as User Agents (UA), Mail Transfer Agents (MTA), and mail delivery processes. It explores key concepts like addresses, delayed delivery, and aliases alongside the essential commands and responses within SMTP. The document includes detailed figures illustrating the SMTP concept, connection establishment, message transfer phases, and the role of MIME in email communication. Thoroughly grasp the mechanics behind email systems and access protocols.
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Chapter 22 Simple Mail Transfer Protocol (SMTP)
CONTENTS • USER AGENT (UA) • ADDRESSES • DELAYED DELIVERY • ALIASES • MAIL TRANSFER AGENT (MTA) • COMMANDS AND RESPONSES • MAIL TRANSFER PHASES • MIME • MAIL DELIVERY • MAIL ACCESS PROTOCOLS
Figure 22-1 SMTP concept
Figure 22-2 UAs and MTAs
Figure 22-3 Relay MTAs
Figure 22-4 Mail gateway
22.1 USER AGENT (UA)
Figure 22-5 Format
22.2 ADDRESSES
Figure 22-6 Address
22.3 DELAYED DELIVERY
Figure 22-7 Sender-sitedelay
Figure 22-8 Receiver-site delay
22.4 ALIASES
Figure 22-9 Alias expansion
Figure 22-10 One-to-many expansion
Figure 22-11 Many-to-one expansion
22.5 MAIL TRANSFER AGENT
Figure 22-12 Email system
22.6 COMMANDS AND RESPONSES
Figure 22-13 Commands and responses
Figure 22-14 Command format
22.7 MAIL TRANSFER PHASES
Figure 22-15 Connection establishment
Figure 22-16 Message transfer
Figure 22-17 Connection termination
22.8 MULTIPURPOSE INTERNET MAIL EXTENSIONS (MIME)
Figure 22-18 MIME
Figure 22-19 MIME header
Figure 22-20 Base64
Figure 22-21 Quoted-printable
22.9 MAIL DELIVERY
Figure 22-22 Email delivery
22.10 MAIL ACCESSPROTOCOLS
Figure 22-22 POP3
