By now it's obvious that many people access emails from their mobile phones. Firstly, you should ensure that your email template is responsive across all devices and platforms. Secondly, try to keep your template simple with minimum image and text content. You can opt for the inverted pyramid model to achieve this feat. 

Links and buttons- 

Links and CTA buttons are the portals for subscriber engagement as they should open to the right and desired pages. Your CTA button should also be visible with contrasting colors between the foreground and background of the button. Make your CTA buttons authentic and prominent for better interactivity. 

Image size-  

The message in your email is conveyed well when the words and images in it compliment each other. However, due to huge file sizes emails take longer time to load and display images properly. Next time, try to restrict the use of images to 30 percent in entire email body copy for a safer option.

Fonts-  

Email marketers often opt for purchased fonts without checking if they will work fine across different devices and operating platforms. Try to opt for web safe fonts or default fonts next time while creating an email template. In case you are using a purchased font, do provide a default backup font for better reach.

Footer check- 

Finally check your email footer and include all the necessary content like "unsubscribe" button, contact details of the email sender and other requisite information. After abiding by the necessary laws and regulations you are good to go and design the perfect email template for your subscribers. 

You can also check out our new episode of Expert Diaries for more design related tips. 

Hope this helps!

Susmit Sen