I have created a HTML email and for some reason when I fire the email out the images don't show in any clients, here is a snippet of the email.
<table border="0" cellpadding="0" cellspacing="0" width="100%" background="http://dev.tpdesign.co.uk/carematch/emails/img/ThinkstockPhotos-78628351.jpg" bgcolor="#2A3647" style="background-image:url('http://dev.tpdesign.co.uk/carematch/emails/img/ThinkstockPhotos-78628351.jpg'); background-size: cover; -webkit-background-size: cover; -moz-background-size: cover -o-background-size: cover; background-position: center center; background-repeat: no-repeat; background-color:#2a364;">