[blowski]

Images on any Apple device are shown by default. If you don't give any dimensions to the image, it will collapse when images are blocked. You can use a table with a background-color as a fallback when images are blocked so it still looks good even without images.

That said, some folks go with image-heavy emails to encourage people to turn on the images. ASOS are particularly well known for this.

And if you want to get really creative when dealing with image-blocking - http://www.campaignmonitor.com/blog/post/3642/email-with-pix...