Advantages and Disadvantages

1
Introduction

• Advantages and Disadvantages
• Userids, Passwords, and E-Mail Addresses
• Message Components
• Mailer Features
• E-Mail Inner Workings
• E-Mail Management
• MIME Types

2
E-Mail Advantages and Disadvantages
Introduction

• Receive and send to
• Any country
• Computer users
• Many users at once
• Computer programs

3
E-Mail Advantages and Disadvantages
Advantages

• Convenience
• Speed
• Inexpensive
• Printable
• Reliable
• Global
• Generality

4
E-Mail Advantages and Disadvantages
Disadvantages

• Misdirection
• Interception
• Forgery
• Overload
• Junk (spam)?
• No response

5
Userids, Passwords, and E-Mail Addresses
Userids

• Login name, user name, account name
• Mnemonic meaning

6
Userids, Passwords, and E-Mail Addresses
Passwords

• Authentication
• At least five characters
• Contain nonalphabetical symbol
• Contain a number
• Uppercase and lowercase letters

7
Userids, Passwords, and E-Mail Addresses
E-Mail Addresses

• username_at_hostname.subdomain.domain
• _at_ at
• Suffix is general from left to right

8
Userids, Passwords, and E-Mail Addresses
Domain Names

• Domain name space (DNS)?
• Distributed naming scheme
• Country codes
• Generic top-level domain names
• com commercial business edu education
• gov U.S. government int international
• org nonprofit organization mil U.S.
  military
• net networking organization

9
Userids, Passwords, and E-Mail Addresses
E-Mail Address Determination

• Ask the person
• Search engine

10
Userids, Passwords, and E-Mail Addresses
Local and Systemwide Aliases

• Easy-to-remember names
• Local or private aliases
• Systemwide (public) alias
• Distribution list (can be local or system wide)?

11
Message Components

• E-mail client displays following information
  about each e-mail message
• Date
• Sender name
• Size (bytes)?
• Subject line

12
Message Components

• E-mail header
• Full header includes route and message id
• From
• Date
• To
• Subject
• Cc
• (Bcc) Blind carbon copy

13
Message Components

• Body
• Greeting
• Text
• Signature
• MIME Attachment (Multipurpose Internet Mail
  Extension)?

14
(No Transcript)
15
Message Composition
Structure

• To
• Cc
• Attachment
• Subject
• Text editor

16
Message Composition
Netiquette

• Emoticons
• SHOUTING
• Flaming

17
Message Composition
Composition

• Signature file
• Attach files
• Insert a file

18
Mailer Features

• Compose
• New
• Reply
• Forward
• Vacation

19
Mailer Features

• File
• Save
• Insert
• Exit
• Attach

20
Mailer Features

• Reply
• To sender
• To all
• Forward
• Include bracketed

21
Mailer Features
Forwarding

• If you have multiple e-mail addresses
• .forward

22
E-Mail Inner Workings

• Mailer, Mail Server, and Mailbox
• Ways of reading email
• Store and Forward
• Central Mail Spool
• Bounce Feature

23
E-Mail Inner Workings
Mailer, Mail Server, and Mailbox

• Mailers
• Mail program, mail application, mail client
• Program (software) that runs on your machine
• Mail server
• Program that runs on a remote computer
• Receives, stores, and delivers e-mail
• Mailboxes
• Disk file

24
E-Mail Inner Workings
Store and Forward Email System
Receive email -Post Office Protocol (POP)?
-Interactive Mail Access Protocol (IMAP)? Send
email -Simple Mail Transfer Protocol
(SMTP)? Specify username, password?
25
E-Mail Inner Workings
Central Mail Spool Email System
26
E-Mail Inner Workings
Bounce Feature

• E-mail bounces is undeliverable
• Bad user account name
• Bad domain name
• Domain name server down
• Other malfunction

27
E-Mail Management
Action Options

• Delete the message, Mark message as junk (spam)?
• Skip a message
• Read the message
• If you come back from vacation, read messages in
  reverse order.

28
E-Mail Management
Vacation Programs

• Considerations
• Do most of your business associates realize you
  are on vacation?
• Are you subscribed to any mailing lists?
• Do you tell recipients who to contact in your
  absence?

29
E-Mail Management
E-mail and Business

• Currently legal for employer to read all company
  e-mail
• Business e-mail is backed-up and such back-ups
  can be subpoenaed
• Businesses sometimes use e-mail filters to
  restrict communications

30
MIME Types

• Multipurpose Internet Mail Extensions (MIME)?
• ASCII text files text/plain
• HTML text/html
• Binary files audio/wav, image/gif,
  application/doc