DNS_Email_Access.pptx - Mail message format SMTP[RFC 821...

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CISC 250 Class Notes 1 Mail message format SMTP [RFC 821]: protocol for exchanging email msgs RFC 822: standard for text message format: header lines, e.g., To: From: Subject: different from SMTP commands body the “message”, ASCII characters only header body blank line
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CISC 250 Class Notes 2 Message format: multimedia extensions MIME: multimedia mail extension, RFC 2045, 2056 additional lines in msg header declare MIME content type From: [email protected] To: [email protected] Subject: Picture of yummy crepe. MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Type: image/jpeg base64 encoded data ..... ......................... ...... base64 encoded data multimedia data type, subtype, parameter declaration method used to encode data MIME version encoded data
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CISC 250 Class Notes 3 Scenario: Alice sends message to Bob 1) Alice uses UA to compose message and “to” [email protected] 2) Alice’s UA sends message to her mail server; message placed in message queue 3) Client side of SMTP opens TCP connection with Bob’s mail server
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