Use the SMTP Sender option on form mails
All of the form mails come from the common address of the store. If you hit Reply, you are sending the response back to the store, not the customer! The Sender option would send replies to the customer and allow software like "CRM for Outlook" for SAP B1 to match the customer email address to a Business Partner automatically. No more guessing which BP has sent the email!
Jonathan Delfraisse commented
Or at least change the reply-to on the email so you don't have to worry about spoofing the email address.