We don't have a FROM check at the moment. I'm not sure how helpful this would be, since it can be arbitrarily spoofed by an attacker.

The email addresses for alarms are editable; if you get spam to one of these addresses, you can change the address. We were also thinking of adding an option to obscure the email address by adding a uid to the end. An example would be trigger-my-alarm-5j3rt@acme.pagerduty.com.

We also offer regex-based filters on both the subject and the body, so you can configure an alarm to only trigger if a certain keyword appears in the message.