When is a mail client considered statistically relevant enough to change something for?
I thought I was being really clever by showing/hiding an entire table with CSS and media queries. What I was worried about was that gmail (and some others) might ignore that and show both sets of content. Of course, this is exactly what happens. But, less than 5% of our recipients view mail through either of those.
My question then is: what is the industry standard by which the decision to make a change comes into play?