POP3 and IMAP are two different protocols (methods) used to access email.
Of the two, IMAP is the better option – and the recommended option – when you need to check your emails from multiple devices, such as a work laptop, a home computer, or a tablet, smartphone, or other mobile device. Tap into your synced (updated) account from any device with IMAP.
POP3 downloads email from a server to a single computer, then deletes it from the server. Because your messages get downloaded to a single computer or device and then deleted from the server, it can appear that mail is missing or disappearing from your Inbox if you try to check your mail from a different computer
|POP3 – Post Office Protocol||IMAP – Internet Messaging Access Protocol|
|You can use only one computer to check your email (no other devices)||You can use multiple computers and devices to check your email|
|Your mails are stored on the computer that you use||Your mails are stored on the server|
|Sent mail is stored locally on your PC, not on a mail server||Sent mail stays on the server so you can see it from any device.|