Media queries are used to make your email templates responsive. They allow for different content to get rendered based on certain conditions, such as screen size. In Sendwithus, media queries have to go into their separate style tags. See the example below:
It’s important to note that not all email clients support media queries. For a full list of supported devices and to learn more about media queries, visit Email On Acid’s post: Media Queries Demystified.
If your emails continue to be unresponsive, contact firstname.lastname@example.org and we’d be happy to help!