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IMAP & POP protocol used in email clients to fetch emails.
IMAP It keeps copy of the emails on server and synchronizes with email client like emails all folders and sub folders.
POP keeps emails on the client pc and it sync only inbox with server. POP works faster than IMAP.
By comparing IMAP is the best option because it sync all folders and keeps copy on the server which helps to check email from any computer.
pop stand for post office protocol it use to receving the email from the email server
smtp stands for simple mail transfer protocol it use to send the email one networking to another network
IMAP
The IMAP protocol, by default, allows the user to keep all messages on the server. It constantly synchronizes the e-mail program with the server and displays what messages are currently present. All the actions performed on the messages (reading, moving, deleting...) will be done directly on the server.
POP
The POP protocol, by default, is set to download all the messages from the e-mail server onto your computer. This means that all the actions performed on the messages (reading, moving, deleting...) will be performed on one's computer.
Because everything is kept on the user’s computer, the user will not be able to reopen messages from any location other than the computer where the messages have been downloaded.