Preventing emails caused by work item comments from a Build User

All,

We have an external build system that runs builds and deployments. Upon successful deployment, it goes into work items that were part of a promotion and updates them with comments saying that the were part of a deployment.

The issue is that we have lots of work items that get commented on with major promotions, and this results in a ton of spam.

Is there any way to prevent the email service from sending out emails when an update is done by a particular user, such as a build system? The existing mail configuration options don't seem to allow that.

Thanks,

Vivek