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and POP3 are different in how and for how long they store mail on the mail server.
System administrators can enable or disable IMAP and POP3 protocols in WHM's Mailserver Configuration interface (WHM >> Home >> Service Configuration >> Mailserver Configuration).
When you use POP3, your mail server deletes messages when you download them. That means that you can only access messages from the computer that you used to download them. Also, POP3 does not require a constant connection while you read email. While this system conserves your mail server’s disk resources, it limits how your users can access their email.