RelativeResourceManager4444

RelativeResourceManager4444 - CprE 530 Lecture 17 Topics...

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CprE 530 Lecture 17 Topics Email – SMTP – POP – IMAP – MIME
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Email Simple Mail Transfer Protocol: First we will look at Electronic Mail systems in general and then we will look at SMTP. A basic electronic mail system performs four functions: Creation: A user creates and edits a message, generally using a rudimentary editing capability. Most systems also allow the user to create a message using the system editor or a word processor, and then incorporate the resulting file as the body of the message. Email Sending: The user designates the recipient (or recipients) of the message, and the facility stores the message in the appropriate mailbox(es) Reception: The intended recipient may invoke the electronic mail facility to access and read the delivered mail Storage: Both sender and recipient may chose to save the message in a file for permanent storage
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Email System User Storage User Authentication MIME MTA MTA SMTP Post Office Protocol OS dependent Storage OS dependent Storage SMTP Storage OS dependent transfer Authentication Mail server Mail server Internet server Email Message Format MIME Header Hello John MTA 2 Header MTA 1 Header Reduced Header MT A 1 MTA 2 Internet MIME Header MIME Header MTA 1 Header MTA 2 Header MTA 1 Header MIME Header
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Email The SMTP protocol is the standard protocol for transferring mail between hosts. The protocol was defined in RFC 821 and later formalized as MIL-STD-1781. SMTP is not concerned with the format or content of the messages themselves, with two minor exceptions. SMTP requires a 7 bit ASCII character set. SMTP adds logging information to message that indicates the path the message took. Email The SMTP protocol attempts to provide reliable operation, but does not guarantee to recover from hosts that lose files. No end-to-end acknowledgment is returned to a message's originator when a message is successfully delivered, and errors are not guaranteed to be returned either. However, the mail system is sufficiently reliable that this is not an issue.
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This note was uploaded on 11/22/2009 for the course CPR E 530 taught by Professor Staff during the Spring '08 term at Iowa State.

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RelativeResourceManager4444 - CprE 530 Lecture 17 Topics...

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