Network Services. SMTP, Internet Message Format. Johann Oberleitner SS 2006
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1 Network Services SMTP, Internet Message Format Johann Oberleitner SS 2006
2 Agenda SMTP Internet Message Format
3 Protocols SMTP Send s POP3/IMAPv4 Read s Administrate mailboxes
4 Agents Mail User Agent (MUA) Mail Client Sends s (via MTA) Let users read s Mail Transfer Agent (MTA) Delivers to target mailbox Mail Delivery Agent Final delivery of messages for local recipient Filtering or categorizing
5 delivery Message Store Sender MUA SMTP MTA SMTP MDA POP3/IMAP Server multiple File Access POP3/IMAP Recipient MUA Recipient MUA
6 SMTP Simple Mail Transfer Protocol Used to SEND mails Originated in 1982 SMTP RFC 2821 (821) How to transmit Internet Message Format RFC 2822 (822) Transmission format Goals Transfer Reliability and Efficiency
7 SMTP Server Standard Port: TCP 25 Types Final destination Intermediate Relay Mail may pass through intermediate relay or gateway hosts Server plays role of client after receiving Gateway Transport messages other than SMTP Responsibilities Server accepts responsibility to deliver a message Properly reports failures to do so "Either message is delivered or not" SMTP client Relaying SMTP server 1 SMTP Server 2
8 MX Resource Record How does SMTP server know to which address send SMTP message Example: infosys.tuwien.ac.at is domain, no single host MX (Mail Exchanger) Record says which host Example domain IN MX 10 mail-exchanger 10 is priority If multiple hosts exist use entry with smallest value
9 Mail address infosys.tuwien.ac.at Identifies users to whom mail will be sent Domain part Host where mail will be delivered to Local-part Location into which mail will be stored Alias Alternative Names that refer to same mailbox
10 SMTP Commands NVT commands Sent as 7 bit ascii text Each command ends with CR LF Commands EHLO, initiates SMTP session MAIL FROM, tells server who sends RCPT TO, tells server where mail goes to DATA, gives server text QUIT
11 SMTP session 220 smtp EHLO myhost.mydomain.com 250-mail.mydomain.com 250 8BITMIME MAIL 250 Ok RCPT 250 Ok DATA 354 End data with <CR><LF>.<CR><LF> Subject: TestSubject To: Test Line. 250 Ok: queued as AB QUIT
12 SMTP commands EHLO sender-domain Extended HELLO Server responds with capabilities of SMTP server MAIL FROM sender- -address Tells SMTP server who sends the RCPT TO receiver- -address(es) Tells SMTP server who shall receive Multiple RCPT TO are allowed
13 SMTP Commands DATA Tells SMTP server the contents of the to be transmitted Is ended with a CRLF. CRLF (= Newline DOT Newline) QUIT Ends SMTP session
14 SMTP Server Replies Acknowledgment or Error Code From receiver to sender Response to a command About 20 numeric codes 1xx : Positive Preliminary reply (only in extended SMTP) 2xx : Positive Completion reply 3xx : Positive Intermediate reply 4xx : Transient Negative Completion reply 5xx : Permanent Negative Completion reply
15 Internet Message Format RFC 2822 (822) Specifies structure Header Contents Originator fields Subject: subject From: sender-authors Sender: mailbox of sender Reply-To: reply address
16 Internet Message Format Destination address fields To: primary recipient Cc: Carbon copy Bcc: Blind carbon copy Sends message to recipient without revealing this address to other recipients Dependent on SMTP server how it deals with BCC
17 MIME Multipurpose Internet Mail Extensions RFC other RFCs Other media-types than text Described with Content-Type and Subtype Eg. image/jpeg, multipart/mixed Multiple formats in one file allowed Attachments (Content-Type = `multipart`) Binary data encoded with 7bits Base64 encoding 64 Ascii characters used to represent binary data `=` special processing Other formats possible
18 MIME - Sample... Subject: Sample Message MIME-Version: 1.0 Content-type: multipart/mixed; boundary=``end`` Note to non-mime conformant readers --end Mail part one --end Another part --end--
19 Procmail Mail processing system Goals Sort incoming mail into folders Preprocess s Start programs upon arrival s/ Uses regular expressions to filter mails
20 Procmail Brief sample # rule to delete all mails that have a # from address containing Mail Delivery # originating from Ukraine :0: * ^From:.*Mail Delivery.*ua$ /dev/null # rule to forward all s < chars to # spamc :0fw * < spamc
21 Summary / 1 SMTP POP3/IMAPv4 next lesson Internet Message Format MIME Procmail Pre-Filtering of s
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