Hello!
The ability to email a PDF for invoices is very cool, but I would like to be able to do this in mass from the list view by allowing my users to select the records they want to email, pull directly from an email field I have added to invoices that syncs with the account email, and send each unique invoice to the appropriate email. My thoughts are that I would build a custom function in the controller.php file that would call on the function creating the invoice PDF document, and attach that to an email with the address and subject dictated in the controller based on each user. I understand that this is a HUGE functionality that doesn’t presently exist, but I would appreciate it if you could give me some tips and point me in the direction of the functions and classes being used to do this on an individual basis for invoices so that I have a little bit of a head start.
Thanks!
P.S. This would be an awesome functionality for future releases, too. 
If I get this working I’ll be sure to pass on the knowledge!