Lot of invalid supplier invoices ae getting created when sent to supplier email id

Summary:

Lot of invalid supplier invoices ae getting created when sent to supplier email id

Content (please ensure you mask any confidential information):

we understand that a number of invalid invoices are getting created as suppliers and users keep copying and sending the invoices to the supplier email ( scanned by IDR) multiple times

A couple ideas to reduce this

• Do we create invoices on any other doc type other than pdf ?

• Can we pre process the email before redirecting it to IDR

• Can IDR scan only if the Supplier email is in the TO field and not in CC

What other filter capabilities are available