Activate FetchMail service
Fetchmail is a software that able to retrieve messages from a remote mailbox server in POP or IMAP protocol.
It can run has a Damon or can be scheduled.
On the Top bar or on the left area, click on the "FetchMail" icon.
Turn to green the "Enable Fetchmail" feature and click on "Apply" button.
The screen will be changed in order to display the daemon status.
Note: Until there is no mail retreival rule, your daemon status will be stopped.