(Electronic Mail) Most popular use of Internet technology Advantages Disadvantages Setting up an account Your account –User id and password –Inbox/mailbox Mail Clients (or Mailers)
Dissection of Address userid or username Host name Institutional Site Name Top-level Domain 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 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 Appropriate formality End messages with your name
Multipurpose Internet Mail Extensions Usually 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 A Web protocol for Web pages Also used when you use Web-based services (i.e. yahoo, hotmail) You log into your account, read your mail, manage mail, and send mail using the Web.
via Post Office Protocol 3 Key point: is downloaded to the local machine and not kept on the server. POP/SMTP Mail Servers Bob’s POP account Sue’s POP account Bob’s Mail Client Sue’s Mail Client SMTP POP SMTP POP SMTP
via Internet Message Access Protocol Key point: is kept on the mail server (online), and can be read* from the local machine. IMAP/SMTP Mail Servers Bob’s IMAP account Sue’s IMAP account Bob’s Mail Client Sue’s Mail Client SMTP IMAP SMTP IMAP SMTP
How 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. 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)