It allows you to visually see your email before it goes out.

http://askdanrather.com/__media__/js/netsoltrademark.php?d=k12.instructure.com/eportfolios/26276/

http://artwalkworld.net/__media__/js/netsoltrademark.php?d=aalrc.instructure.com/eportfolios/12670/


縺ゅ縺 メッセージ
THE R NUMBER What it means and why it matters TEST AND TRACE How does it work.