Hello, what is the best way to find out what search or workflow triggered an email notification to a customer?

Email was sent from which record?

most likely sales order or item fulfillment. when i check the active workflow i don't see any real identifier

You can try this for a saved search: https://netsuite.smash-ict.com/how-to-quickly-find-the-particular-saved-search-that-triggered-an-email-with-a-custom-subject-line-in-netsuite/ We also started putting the internalid of the saved search in the body of the email message section. It's maybe a little odd to see, but it makes troubleshooting this kind of thing so much easier.