Can I use CiviRules to send a notification to the administrator when an email gets bounced?
I don't think you can do this (at least without development). Most significantly, there isn't any trigger from within the bulk mail system in Civirules so you would not be able to catch the bounces that don't put the email on hold. I suspect that adding that functionality would be very difficult as I doubt that these email bounces go near the sort of things that Civirules for a trigger. There isn't even an option to catch the change to email on hold. The trigger &quot;contact changed&quot; with the condition &quot;field value comparison&quot; doesn't off the email on hold status as option, though I think adding this would be relatively straight forward if you want to write some code.