POP and IMAP determine how your incoming mail is moved, saved, deleted and synchronized between the email server and your inbox. POP moves email from the server to your device (PC, tablet, smartphone) when you’re accessing email and either saves or deletes it from the server and your inbox. With the IMAP setting, email that is received at your mail server stays there, allowing you to track what is happening in each local inbox.
How to find pop and imap setting
In other words, POP focuses on the email messages at the inbox on your local device, while IMAP focuses on making sure the email messages on the server and your inboxes are all synchronized.
With outlook open Click the tab labeled “File” on the top left hand side.
Select “Info” on the left hand navigation
Click on the Outgoing Server tab and click on the My Outgoing server (SMTP) requires authentication check box
Click the “Manually configure” checkbox and click next.
Make sure Microsoft Exchange, POP3, IMAP, or HTTP is selected and click next
Click the “Manually configure” checkbox to bypass the auto configure and click next.
Click on the Outgoing Server tab and click on the My Outgoing server (SMTP) requires authentication check box.