Testing with Litmus
Testing of email templates is pretty complicated when you want to gather all of testing environments. Its going to be easier when you will use Litmus which makes a screenshots of your email template in most known email clients.
After creating of your template you will need to copy your HTML code and paste it into the system. If your e-mail has some images hosted on some server you can send an email to your account in Litmus. Litmus creates on application side your dedicated email address. When you send email to this address you can test this email in Litmus.
As you can see on screen above you can check your code in most known email clients. Screenshot was made on trial version of Litmus account that why some of views are not activated.