Mobile Email Campaign has always been a communication medium for marketers. According to findings by Reachmail, ignoring trends in mobile browsing and customer satisfaction can torpedo email marketing success. Mobile campaigns require specific tactics that take into consideration screen size, times when mobile devices are used and which demographic is using small screens to open marketing email.
The following infographic shows what to avoid on mobile campaigns “7 Ways to Run an Unsuccessful Mobile Email Campaign”. The statistics show that over 40% of emails are opened on mobile devices.

A bonus tip: Most of the time, we miss out checking the email ID of the recipient. So, we should always check the recipient's email ID whether deliverable or not. You might get a lot of Email Verifiers over web and we suggest you to use https://hunter.io/email-verifier before you send any email.
Source : ReachMail