HTML Tags not escaped in E-Mails

I came across this when this post was in my Atom Digest. Its title only showed up as “Why”, and it appears in the source as

<a href=3D" ef-css-master-css-media-screen-title-no-title-charset-utf-8/25725" style=3D= "text-decoration: none; font-weight: bold; color: #006699; line-height:1.= 5em;; text-decoration: none; font-weight: bold; color: #006699;; color: #= 0088cc">Why <link rel=3D"stylesheet" href=3D"/css/master.css" media=3D"sc= reen" title=3D"no title" charset=3D"utf-8"></a>

Sorry about that this was fixed.