MRTG Sending Alerts

Has anyone used MRTG to send alerts via setting the thresh options to call a script? I keep hearing that MRTG won’t send alerts but after reading the reference at:
http://oss.oetiker.ch/mrtg/doc/mrtg-reference.en.html

it sure looks like it will if you set ThreshMaxI and ThreshProgI…

Anyone have an email script to share?