@KarenBarboza Welcome. I have my RMA Notification on a data directive on RMARcpt.
If you are On Prem these are a couple of tools for sleuthing that will help.
ServerLog.txt can have all of the bpms that are called listed so you have a place to look for them. This needs to be enabled in the app server.
@hkeric.wci has a tip on using cmnder in the link below that you can search all of your bpms for a phrase out of the email to find the routine. I use this a lot even on my own code.