Persistent icon and message "waiting for new emails" how to remove

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How to configure Push?

K-9 Mail (5.735 and newer) supports Push for IMAP accounts. Push means the app will maintain a connection to the incoming mail server and be notified as soon as a new message arrives. Enable Push for an account When setting up a new account Push is disabled by default. To enable it go to Settings, select the account you want to configure, then open the Fetching mail section. The Push folders setting is used to configure which class of folders should use the Push mechanism to wait for new messa…