By default Plesk IMAP maximum connections per IP is set to 4. If you are using an email client that checks multiple mailboxes, this limit is easily reached.
To increase the limit, edit "/etc/courier-imap/imapd":
MAXDAEMONS=80
MAXPERIP=40
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The same limits can be applied for cPanel running couriertcpd.
The location of the config file is at:
/usr/lib/courier-imap/etc/imap d
Restart courier-imap after config changes via:
/etc/init.d/courier-imap restart