What is POP3?
POP3 stands for Post Office Protocol 3. POP/POP3 is an internet protocol that is used to access emails from your mail server. Unlike (IMAP) Internet Message Access Protocol, POP/POP3 email massages downloaded to your computer are deleted and no longer accessible via webmail or any preferred mail program. Furthermore, this makes the use of POP/POP3 unusable for accessing emails from different devices.