A friend of mine has to send a normal email **using ONLY** HTML/HTML5 (or CSS/CSS3, but that will be of little use for this problem) for his school.
His classmates already said that can't be done without mailto: etc., but the teacher insisted it was possible. What do you guys of Stackoverflow think? We read about setting up you own smtp-client, but there was no example and we are not experienced with HTML5.

Thanks in advance.

EDIT:

If you guys think you know a way to fool the teacher, for example use ServerSide Scripting without let the teacher know, we'll accept it as well ;).

Edit 2:
I was unclear in the question; the prblem is to SEND an email without mailto: etc. using HTML, not an email containing HTML