Previews in Outlook

[benwmills]

We've been doing some testing using a service called Litmus. It seems to indicate that the HTML emails that we're building with Postal are displaying HTML tags in the preview window in various versions of Outlook. Here's a screenshot:

https://www.dropbox.com/s/4i2oj0phdxzgz6g/Screenshot%202015-01-25%2011.46.47.png?dl=0

You can see the DOCTYPE tag in the preview. To be honest, we haven't seen this in our real email clients, but none of us use Outlook. Are you aware of any issue with Outlook/Postal?

We're not generating multi-part HTML/text emails (http://aboutcode.net/postal/multi-part.html). Instead, we're just building an HTML only email in the standard whatever.cshtml view file.

We're wondering if this is a Litmus issue or we're maybe doing something wrong with Postal.