I recently sent out an email for a client through Constant Contact, an ESP I have not used since I started creating responsive emails. When I sent a test of our custom coded email, it did not come through responsive on a colleague's iPhone 4s. I then sent a test to Litmus through the preview/test mode in CC and while it shows up responsive in Android 4, it's showing the desktop view on all versions of iPhone. Here are the Litmus results.

It seems like CC is not stripping out the media queries, but then why would it not work on the iPhones?

I'd love to get confirmation of whether this is something wrong with my code, or something wrong with CC. Their support was not super helpful.

Thanks for any insight! I'm so glad I have a place to voice this question (and vent a little, too!)