Since other push implementations may keep connections for pushing mail backend for new mails, that possible vast connection usage might harm certain IMAP backends. Therefore introduced a poll-based alternative for mail push in IMAP bundle to avoid keeping connections alive.

This feature can be enbled/disabled and configured in file with following property:

# Notify about recent messages using mail push events. This is a poll-based alternative for any connection-keeping mail push bundle.
Default is false

# The frequency when a check for recent mails is enforced.
Default is 300 seconds.

# The full names of the folders to consider.
Default is inbox folder