yiisoft/yii2 — pull request #1333 by amnah (2013-11-27 01:09:37+00:00)
Title: Small enhancement - add html output option to yii mailer for $useFileTransport

I started using Mailer::$useFileTransport for development, but discovered that the output contained the raw email data instead of the html data (which I was expecting due to how laravel works).

I added this option in because I needed to see what the actual email looks like.