missing subjects on alert emails

Has anyone seen the problem where 'MAIL' recipients receive messages with no subject? Am I missing a configuration option here? Note that alerts are sent fine, but the subject is empty. Here is the config line from hobbit-alerts.cfg. Note that I blanked out the company domain.

HOST=%sac-p* SERVICE=* EXSERVICE=conn MAIL brian.lynch at xx.xx.com COLOR=red,yellow