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Presented By
Baljit Saini
E-mail is used for sending a single message
that includes text,voice,video or graphics to
one or more recipients
Sending E-mail: To send e-mail user creates a
mail which includes envelope and a message.
 envelope contains sender address, receiver
address and other information
 Message contains header and the body. Body
of the message contains the actual
information to be read by the recipient
Addresses: to deliver a mail handling ystem
must use an addressing system with unique
addresses. Addressing system used by SMTP
consist of two parts
Local part @domain name
 User Agent
 Mail Transfer Agent
 User agent is a software package that
compose,reads,replies to and forward
messages. It also handles mail boxes
User Agent
Composing
Message
Reading
Message
Replying to
message
Forwarding
Message
Handling
mailboxes
 Command Driven
 GUI based
 SMTP can send messages only in 7bit ASCII format
 It cannot be used for languages that are not
supported by 7 bit ASCII characters
 MIME is a supplementary protocol that allows non
ASCII data to be sent through SMTP
USER USER
Non ASCII code Non ASCII Code
ASCII code ASCII Code
MIME
SMTP SMTP
MIME
 E-mail transfer is done through mail transfer
agent. To send e-mail system must have
client MTA and to receive e-mail system must
have server MTA
Commands
Response
MTA Client MTA Server
 Connection Establishment
 Message Transfer
 Connection Termination
Delivery of e-mail from the sender to the
receiver consist of three stages
 Stage 1
 Stage2
 Stage 3
First Second Stage Third
desktop Mail
Server
internet Mail
Server
desktop

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E-Mail.ppt

  • 2. E-mail is used for sending a single message that includes text,voice,video or graphics to one or more recipients Sending E-mail: To send e-mail user creates a mail which includes envelope and a message.  envelope contains sender address, receiver address and other information  Message contains header and the body. Body of the message contains the actual information to be read by the recipient
  • 3. Addresses: to deliver a mail handling ystem must use an addressing system with unique addresses. Addressing system used by SMTP consist of two parts Local part @domain name
  • 4.  User Agent  Mail Transfer Agent
  • 5.  User agent is a software package that compose,reads,replies to and forward messages. It also handles mail boxes User Agent Composing Message Reading Message Replying to message Forwarding Message Handling mailboxes
  • 7.  SMTP can send messages only in 7bit ASCII format  It cannot be used for languages that are not supported by 7 bit ASCII characters  MIME is a supplementary protocol that allows non ASCII data to be sent through SMTP USER USER Non ASCII code Non ASCII Code ASCII code ASCII Code MIME SMTP SMTP MIME
  • 8.  E-mail transfer is done through mail transfer agent. To send e-mail system must have client MTA and to receive e-mail system must have server MTA Commands Response MTA Client MTA Server
  • 9.  Connection Establishment  Message Transfer  Connection Termination
  • 10. Delivery of e-mail from the sender to the receiver consist of three stages  Stage 1  Stage2  Stage 3
  • 11. First Second Stage Third desktop Mail Server internet Mail Server desktop