Google will resize email to fit your phone's screen
 

Sure, you can open elaborately-crafted email using Gmail on your phone, but that doesn't mean you want to. Most web-based messages are formatted for the desktop, and Gmail doesn't tweak them to fit the confines of a mobile screen. Mercifully, you w...

https://www.engadget.com/2016/09/14/...ze-rich-email/