Check manual page of check_mail

POP3/IMAP Connection and Optional Mail Forwarding
Distribution	Official part of Checkmk
License	GPLv2
Supported Agents	Active

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.