page5 - Email and SMTP 1 Client Server architecture which...

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Email and SMTP 1. Client Server architecture which keeps a mailbox for each user on the SMTP mail server. 2. User Agents – are email programs like Outlook, and Apple Mail. 3. Messages are sent to the mailbox on the mail server and then held in the message queue till they can be sent out. 4. Each SMTP server has a server and client side software. 5. Disadvantages a. SMTP is old, and only allows 7-bit ASCII encoding. Limits attachment size. 6. Advantage a. SMTP does not use intermediate mail servers, provides direct connections to receiver’s mail server. 7. SMTP vs. HTTP a. SMTP is a push protocol. Sending machine pushes data out to receiver, and initiates the TCP connection. b. HTTP is a pull protocol that initiates TCP connection, to get the data from the receiver. c. Both use persistent TCP connection, but HTTP sends objects through and SMTP sends messages through to get data across link. 8. What is the Mail Process a. Alice sends mail to her mail server. Her mail server then repeatedly
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