We recently sent an email campaign that rendered perfectly in testing but then a recipient sent us a screengrab of how the HTML text appears on his iPhone - as you can see, the line spacing is wonky and the text becomes overcrowded. Can't seem to find anything similar online and might be the font size settings on his device - any ideas or solutions? Looks fine on mine and the client's iPhones. Thanks :-)

Here's the screengrab: http://www.tasafaris.com/news/2016_05_ct/IMG_6937.PNG