How to make a template from a letter?

Question

HTML

Beautiful newsletters come, I would like to understand how you can copy the template and only then change the text and send it to your subscribers.

Answer 1

If this is gmail.com, then:
Or, as in all mails through the developer console:
Right-click on the body of the letter and copy the element through the console.
Or first open the console (F12 button) and find the desired object...