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POP3 and IMAP

IMAP and POP3 are methods used by your computer to access e-mail messages from a remote server. Cylonet e-mail accounts are compatible with both IMAP and POP3. However, we would recommend using IMAP over POP3, particularly if you use more than one device for accessing mail.
The differences are explained below.

IMAP

IMAP (Internet Message Access Protocol) is an advanced protocol for receiving e-mail. It is a method of accessing e-mail messages which are stored on a mail server.

The main advantage of IMAP over POP3 is the ability to keep the original e-mail stored on the mail server and access the same account from multiple devices. Unlike POP3 where e-mail is downloaded to the computer or device checking for mail and completely removed from the mail server (unless specifically set not to do so), IMAP simply downloads a copy of the e-mail. This is more convenient and safer as the e-mail account can be set up on multiple computers and devices using IMAP and the original e-mail will always remain on the mail server. (There are settings in your email app for deleting messages from the mail server to prevent your mailbox from getting too full.)

If a mobile phone or personal computer, configured to be the primary means of checking email and malfunctions is lost, stolen, or becomes inoperable, this means the e-mails will not be lost. You can set up the account using IMAP on another computer or device and all e-mails will still be available.

POP3

POP3 stands for Post Office Protocol version 3.
When an e-mail is sent to your address, it is stored on the mail server until it is downloaded via your e-mail client (Outlook, Mail, your mobile, etc.) using POP3. After the e-mail has been downloaded to your client, it is then removed from the server.

For example if you were to set up an e-mail account on a mobile phone as POP3, the phone would download all e-mails, removing them from the server. If you then were to check the same e-mail account, using either Webmail or your home computer, the emails would not be there as they would have already been downloaded by the mobile phone.


Links:

Using POP on iOS device (iPhone, iPad):

Get help if you have issues using a POP email account with more than one device – Apple Support

https://support.apple.com/en-gb/HT201855