title: Mailcow: Usage per Mailbox, Quota and Number of Messages agents: linux catalog: unsorted license: GPL distribution: check_mk description: Tested with Mailcow versions 2022-07a and higher (use at your own risk with lower versions). Tested only with fully dockerized Mailcow instances. You have to provide at least the hostname/IP of your Mailcow server and an API key. Got to configuration settings and create a new API key (read-only access is sufficient). Allow API access to at least your CheckMK server IP address. Shows several information about a Mailcow mailbox, e.g. number of messages and quota. The check will raise WARN/CRIT if quota usage is above the configurable levels. The check will raise WARN/CRIT if number of messages is above the configurable levels. item: mailboxname inventory: one service is created for each mailbox