IMAP (Internet Messaging Access Protocol) and POP3 (Post Office Protocol) are email protocols that let you access and read your emails when you set up your email account in a third party email client like Outlook, Apple Mail, or Gmail.
IMAP syncs your email client with your email server. The status of your emails is updated when you read, delete, or reply to emails so you’ll see updates if you log in on another device at a later time.
POP3 downloads the emails from your email server to your email client. The status of your emails is not updated on the email server when you read, delete, or reply to emails so you won’t see updates if you log in on another device at a later time.
We recommend IMAP for most uses. It helps keep you up to date when accessing your email.