Emailing Invoices / Factoring Companies

I would like to have the option to set a default email when emailing invoice. For example: after you complete your dispatched load and ready to email invoice to a Factoring Co. have the option to set your Factoring Co email as default. The way it is now when we want to email invoices, we select the send via email and see an entire list of previous emails. I would like to set my Factoring Co as default, so have an option to select any email in that list as default email and it will be in the box every time you select the “send via email” button. When emailing your invoices to your Factoring Co. if you don’t want a default email set you don’t select “set as default”