BDC5eChapter6 - Chapter 6: Distributed Applications...

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Chapter 6: Distributed Applications Business Data Communications, 5e
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Electronic Mail Features Message Preparation Word processing Annotation Message Sending User directory Timed delivery Multiple addressing Message priority Status information Interface to other facilities Message Receiving Mailbox scanning Message selection Message notification Message reply Message rerouting
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Public vs Private Email Public Provided by a 3rd party vendor Available over one or more public networks Examples: MCI Mail, AOL Private Integrated with user’s computer equipment Often part of an integrated tool, eg PROFS Used for internal messaging Internet mail does not fit into either of these categories; it is a transfer mechanism rather than a contained system
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Single System E-Mail Only allows users of a shared system to exchange messages Each user has unique identifier and mailbox Sending a message simply puts it into recipients’ box Example: AOL
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Multiple Systems E-Mail Distributed system enables mail servers to connect over a network to exchange mail Functions split User agent handles preparation, submission, reading, filing, etc Transfer agent receives mail from user, determines routing, communicates with remote systems Interconnection requires standards
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Simple Mail Transfer Protocol (SMTP) Standard for TCP/IP mail transfer, defined in RFC 821 Concerned addressing and delivery, not content, with two exceptions Character set standardized as 7-bit ASCII Adds log information to message that indicates message path
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BDC5eChapter6 - Chapter 6: Distributed Applications...

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