3.Consider the below architecture of email system as shown in figure (3.1) What's the difference between SMTP protocol for email and HTTP for web? (3.2) Which transport protocol email system should use for reliable delivery of emails? (3.3) What are the necessary functions message transfer agent need to play to ensure reliable delivery of emails? Mailbox Email X Message Transfer Agent SMTP Message Transfer Agent Sender User Agent 1: Mail Receiver User Agent 2: Message transfer 3: Final delivery submission