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Email (Electronic Mail)
• Most popular use of Internet technology
• Advantages
• Disadvantages
• Setting up an email account
• Your email account– User id and password– Inbox/mailbox
• Mail Clients (or Mailers)
Dissection of Email Address
userid orusername
Host name InstitutionalSite Name
Top-levelDomain name
Specific General
Top Level Domain Names (US)
• com• edu• gov• int• org• net• mil
• Commercial business• Educational institution• Governmental agency• International entity• Non-profit organization• Networking organization• U.S. military
Some Country Top Level Domain Names
• au (Australia)• ca (Canada)• cl (Chile)• de (Germany)• es (Spain)• fr (France)
• hk (Hong Kong)• jp (Japan)• nl (Netherlands)• uk (United Kingdon)• us (United States)• za (South Africa)
Demonstrate email
• Pine, Web-based Netscape
• Send and receive
• Addressbook
• Netscape (send & receive attachments)
Netiquette
• Always have a subject• Do not use ALL CAPS• Expression and Inflection• Smileys/Emoticons :-), 8-(, :-{D• Jokes, chain letters, etc.• Responding to email• Appropriate formality• End messages with your name
Multipurpose Internet Mail Extensions
• Usually email consists of ASCII text
• MIME allows for a variety of files to be sent & received as attachments
• Files can often times be viewed in real time
• Security problems can arise
• Be careful of sending large files when the recipient is not expecting it.
Web-based Email
• A Web protocol for Web pages
• Also used when you use Web-based email services (i.e. yahoo, hotmail)
• You log into your account, read your mail, manage mail, and send mail using the Web.
Email via Post Office Protocol 3
Key point:Email is downloaded to the local machine and not kept on the server.
POP/SMTP Mail Servers
Bob’s POP
account
Sue’sPOP
account
Bob’sMail Client
Sue’sMail Client
SMTPPOP
SMTP
POP
SMTPSMTP
Email via Internet Message Access Protocol
Key point:Email is kept on the mailserver (online), and can be read* from the local machine.
IMAP/SMTP Mail Servers
Bob’s IMAP
account
Sue’sIMAP
account
Bob’sMail Client
Sue’sMail Client
SMTPIMAP
SMTP
IMAP
SMTPSMTP
How Email Works
• SMTP (Simple Mail Transfer Protocol) on your mail server– Verifies the DNS address– If successful, prepares the mail and sends it out
• When message is sent it is broken down into small packets and reassembled.
• Email can ‘bounce’ if:– Bad user account name or domain name– Domain name server is down for several days– Other reasons (i.e. message too big)