Checks the given mailbox for new mail and returns WARNING or CRITICAL based the on presence or absence of new messages and/or the presence or absence of recent e-mails.
Age-based checks can be an arbitrary number of seconds even with IMAP servers which do not support RFC 5032.
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Checks whether a web page redirects somewhere. If so, returns OK; otherwise, runs another check plugin. Intended for use with check_imap_mailbox, but can be used with other plugins as needed.
Example:
The Museum of BOB allows people to reserve tickets online for special events a few times a year. When reservations are closed, the reservation site redirects elsewhere. Their sysadmin wants to trigger an alert if confirmation e-mails aren't going out when reservations are open but doesn't want alarms warning that e-mails aren't going out when none are being sent.
redirect_or --url https://reservations.example.com/reserve/ --plugin check_imap_mailbox -- --host imap.example.com --starttls --user confirmations@example.com --passfile /etc/monitoring/secrets/confirmations --folder "Inbox" --younger 64800 --min-younger-crit 1 --min-younger-warn 3