Chapter 20 SMTP. Slides from TCP/IP - Forouzan. User Agent (UA) Addressing Delayed Delivery Aliases Mail Transfer Agent (MTA) MIME POP.
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1 Chapter 20 SMTP User Agent () Addressing Delayed Delivery Aliases Mail Transfer Agent () MIME POP 20-1 Figure 20-1 SMTP concept User User SMTP client TCP ephemeral port SMTP server TCP well-known port
2 Figure 20-2 s and s User A User B client server 20-3 Figure 20-3 Relay s User A User B Server Relay Relay
3 Figure 20-4 Mail gateway User A User B Mail system Mail gateway Private network 20-5 Figure 20-5 Format of an Behrouz Forouzan De Anza College Cupertino, CA Sophia Fegan Com-Net Cupertino, CA Mail From: forouzan@deanza.edu RCPT To: fegan@comnet.com Sophia Fegan Com-Net Cupertino, CA Jan. 5, 1998 From: Behrouz Forouzan To: Sophia Fegan Date: 1/5/98 Subject: Network Header Subject: Network Dear Mrs. Fegan: We want to inform you that our network is working properly after the last repair. Dear Mrs. Fegan: We want to inform you that our network is working properly after the last repair. Body Message Yours truly, Yours truly, Behrouz Forouzan Behrouz Forouzan
4 Figure address Local part Address of the mailbox on the local Domain name The domain name of the destination 20-7 Figure 20-7 User A Sender-site delay Spool
5 Figure 20-8 Receiver-site delay User B Mailboxes Server 20-9 Figure 20-9 User A User B Alias expansion Spool Mailboxes Alias exp. Alias exp. Database Server Database
6 Figure One-to-many expansion Friends (One name) One-to-many alias expander Database... (Many recipients) Figure John Many-to-one expansion (One recipient) Many-to-one alias expander... Database (Many addresses)
7 Figure User A User B The entire system Interface Interface Spool Mailboxes Mailboxes Spool Alias exp. Alias exp. Database Database Server Server Figure Commands and responses client Commands Responses server
8 Figure Command format Keyword: argument(s) Figure Connection establishment client server 220 service ready HELO: deanza.edu 250 OK
9 Figure Message transfer client server MAIL FROM: 250 OK RCPT TO: 250 OK DATA 354 start mail input From: Behrouz Forouzan To: Sophia Fegan Date: 1/6/98 Envelope Header Subject: Network Dear Mrs. Fegan We want to inform you that. Yours truly Behrouz Forouzan. 250 OK Blank line Body Figure Connection termination client server QUIT 221 service closed
10 Figure MIME User User MIME Non-ASCII code Non-ASCII code MIME 7-bit NVT ASCII 7-bit NVT ASCII SMTP 7-bit NVT ASCII SMTP Figure MIME header header MIME-Version: 1.1 Content-Type: type/subtype Content-Transfer-Encoding: encoding type Content-Id: message id Content-Description: textual explanation of nontextual contents MIME header body
11 Figure Base Non-ASCII data Base 64 converter (51) (8) (4) (57) z I E ASCII data Figure Quoted-printable & Mixed ASCII and non-ascii data L Non-ASCII K Quotedprintable & L = 9 D 9 ASCII data K
12 Figure POP3 and SMTP Sending mail SMTP Server Receiving mail Checking Downloading mail Server POP3 Desktop Mail server
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