Email alerts in ZoneMinder
Making ZoneMinder not spam you with all past events
If you create a background alert to sent email or text messages or whatever, there's no way to tell zoneminder that you only want that alert to be triggered on *new* events - which is to say, there's no way to prevent it from sending you an email alert for every single matching even that's ever been saved since you first installed zoneminder. I learned that "Unarchived" does not mean what I thought it meant when I got 5509 emails for events going back several years.
Although there's no way to do this through the UI, you can just edit the zm database directly:
update Events set Emailed = 1 where Emailed = 0;