welcome to CiviCRM Stack Exchange! Navigate to Administer -> CiviContribute -> iATS Payments settings -> Here you can enter an email address which should be notified of failures (first option). There are some other settings here you may want to explore as well.


As others said in the comments, CiviRules can work in this scenario; if you set it up where the trigger is "contribution changed," and the conditions are that the contribution is failed and the contribution recur ID is not null (just to eliminate the possibility of getting flagged for a failed one-time payment), you can then send an email to ...

Only top voted, non community-wiki answers of a minimum length are eligible