Two Emails not responsive/too wide for smartphone
Two emails appear to be extremely wide and you need to scroll left to right in a smartphone (tested on Android at least).
These are the only two emails I found:
1) ACTIVATE YOUR ACCOUNT - send by Appthemes CONFIRM EMAIL plugin
2) USERNAME AND PASSWORD INFORMATION - generated when a user is created from Wordpress backend/sends new account information to the user.
Also, this email appears wider than the rest in a smartphone:
1) THANK YOU FOR REGISTERING -sent to new users registering from front end
2) NEW AD SUBMISSION - sent to admin