How to know what contact will agree to accept an electronic invoice?

Hello,

We have implemented a business process to send invoices to our customers who agree to receive them in an email.  Our Receivables Department flags these contacts by job title and adds them to the primary bill to address.

Our Sales Department does not think the job title is the correct field to flag the contact who agrees to receive the emailed invoices.  We don't own iReceivales.  Does anyone have any suggestions?

 

Thanks

Lisa