Django, send email template?

Question

Django

Hello guys.
I want to send a letter using a template and insert my variables there.
Everything turns out, but there is one problem, the letter comes in the source code.
I send a letter like this.

param = {"one":"Adrian","two":"two_avariable"}
message = render_to_string('newsletter/register.html', param)

and send it like this

param = {"one":"Adrian","two":"two_avariable"}
 template = loader.get_template("newsletter/register.html")
 message = template.render(param)

But the letter come like this