Retina Display Email Signature
Our company uses gmail as the email client, and so our signatures are made up of text that can be edited in the text editor and images that have to be hosted on our server.
CSS is not an option.
Any idea on how I can prevent my email icons from showing up as blurry?
Use SVG images.
Worth noting: SVG isn't supported in older versions of IE (8 and prior). I'm not sure how it renders in crappier email clients, either.
Maybe SVG with PNG fallback, because anything with a Retina display can probably show SVG.
Another option: Don't use an image in the email signature. Why is it a requirement?