Hello @MNPM ,
The terms newsletter, brochure, and email are honestly interchangeable since they'd all be emails in the end. It's just a matter of how you want the body of the email composed. If you're wanting to include a "traditional" email signature, you can typically achieve this with a text block, and maybe an image block if so desired. If you have a handwritten signature you'd like to include, you can add that as an image.