With acceptance letter builder, you can build and customize the acceptance letter PDF. Once customized, you can click on Generate Acceptance Letter button to generate a PDF copy of an accepted abstract to see how it looks like.
Then click on Send Acceptance Letter button in the top right corner. This would take you to the Email campaign page where you can create an email, sort of a cover letter, to be sent along with the acceptance letter PDF.
Before sending the campaign, you can send a test mail to yourself.
When ready, simply click on Send Email button in the top right corner to send the acceptance letter and PDF to all accepted authors.