The iPhone Native Mail App vs The Gmail App

Occasionally, an excited email designer contacts us, saying, ‘I was testing on my iOS and suddenly my styles are working in Gmail!  It’s actually responding to my responsive design!’ Or a frustrated designer will email us, saying, ‘I thought responsive designs worked on the iPhone? My customer says this email isn’t working at all.’

These misunderstandings have a common source: confusion about the mail apps for the iPhone.