I managed to do this within the Prepare Form tool. Add a button (click the OK button from the menu on top), then double-click the button you've place within your pdf. Under Actions, Select Action, Scroll down to Submit a Form. Edit the Submit Form and add a mailto: purchasingmanager@yourdomain.com. Check the PDF The Complete document option to send the entire form.
In Options: put text into the Label section (like submit or email).
Save the PDF.
When your users click on that button, it will prompt them to use their email application and also give them an option to save the document.
This is different from the distribute function which I'm hoping to figure out soon. 