Thanks to Zenoss Community member David Buler for providing his EmailPing ZenPack for monitoring email-based alerting mechanisms.  If you use an email system and an Internet connection for event notification, you have numerous single points of failure that can prevent you from receiving alerts.  The email server itself, switch, firewall, power supply, ISP, etc...  EmailPing is designed to monitor your alerting mechanism as a single entity and generate events when there is a problem. When combined with SMS via modem, you can be notified if your email/Internet based alerting mechanism is down.

Thanks David!