IMAP special features (recommended):
E-mails are saved on the mail server and regularly synchronised and downloaded by the e-mail program. This means that if you lose your device (e.g. your computer or mobile phone), you won’t lose your e-mails.
POP3 special features:
Once the connection is made between the e-mail program and mail server, e-mails are downloaded directly to the device and then deleted from the mail server.