Check manual page of check_mail
POP3/IMAP connection and optional mail forwarding
Logs in into an IMAP or POP3 mailbox to monitor whether or not the login is possible.
An extended, optional, feature is, that the check can fetch all (or just some) mails
from the mailbox and forward them as events to the Event Console.
This check can be configured using WATO.
No discovery supported.