Is it possible to have an invoice that has been generated from the ticket order billing process automatically emailed out to a costituent?
I have not done this, but what I think you could do is use the Ticket Order Billing Reprint report to get the customers and emails you need to send out for. Then use it in a word merge or somethng to create the email blast.
Another option might be to take the existing Ticket Order Billing Reprint report and modify it to send out emails automatically through SQL Database Mail.