We are now using quickbooks to send out various sales/purchase forms, we also have multiple users, but they are all sent from our generic e-mail address.......

When sending sales and purchase forms, QuickBooks uses the default email address from the company settings, as the option to add the user's email address is unavailable. I hear your suggestion and recommend that you send feedback directly to our product engineers so that they can evaluate your idea, sam. I'll guide you how.

1. Go to the Gear icon.
2. Select Feedback under Profile.
3. Enter your suggestion. Then, click Next.
   
   

Alternatively, you can look for a third-party application that helps you send it to different email address. 

1. Go to this link: QuickBooks Apps.
2. You can select a specific category under the Categories section.
3. Then, make sure to review the key benefits and FAQs.
4. Once done, click the Get app now button.

Additionally, you can visit these articles for more additional information about sales form: 

• Customise invoices, estimates, and sales receipts.
• Add, customise, or remove logos on sales forms. 

Please let me know if you have other questions. I'll be around to help.