Which protocol retains a message in a mailbox on a server, even after the message is accessed by a user on a local client device?
- IMAP4
- DNS
- SMTP
- POP3
Answers Explanation & Hints: The IMAP4 protocol will keep any message accessed by a client device in the mailbox on the server. The message is removed from the mailbox only after it is deleted by a user on the client device.