The closest you can do in Axure alone is use variable to build a mailto: link, like so:
mailto:someaddress@email.com?subject=[[AxureSubjectVariable]]&body=[[AxureBodyVariable]]
But all that will do is open the user’s default mail client with those values prefilled. If you want to mail an HTML email from a server, well you’ll need some sort of mail service you’re using. You could make a GET request from Axure with a link and have your server process the request and send the mail, but that’s well beyond the scope of Axure and totally up to you.
If this were my project, I’d just make a mockup of what the email would look like and include that separately.