Different protocols on email systems
A protocol is a standard used at the end of every communication channel, to properly transmit information, such as the exchange of information between the mail client and mail server. The protocols in use are
1. Internet Message Access Protocol (IMAP)
A standard protocol which is used to access email from local servers. In IMAP protocol, the internet server receives the email and stores it for the user. As this requires a small data transfer, it works well over slow connections.
2. Post Office Protocol 3 (POP3)
It provides a standardized and simple way for users to access their mails and to download them to their machines. All email messages will be downloaded to the local computer, and can be viewed later even when the user is offline. However, it increases chances of viruses being transferred to the computer.
3. Simple Mail Transfer Protocol (SMTP)
It is used by Mail Transfer Agent(MTA) only to deliver emails to the recipient’s mail server. The use of SMTP protocol is dependant only on certain network/ISP settings.
4. HyperText Transfer Protocol (HTTP)
HTTP is used to access the mailbox, and is not solely dedicated for email communications. This protocol can be used to compose and retrieve emails from the user’s account.
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