Notification plug-in that sends the standard Checkmk HTML email to LDAP groups.

A recipient without "@" is treated as an LDAP group name, and the mail address stored on the LDAP group object is used. The LDAP connections already configured in the site (Setup > Users > LDAP connections) are reused, so no extra credentials are needed.

Everything else is handed to the built-in mail plug-in, and the rule offers the complete HTML mail configuration.