Reasons to Use HTML
Can Track Opens
Can Make Text Links Clickable
Can Use Images and Colors – Good Branding Opportunities!
Easy to Break Up Content into Digestible Bits (using columns, headers)
Reasons Not to Use HTML
Takes Longer than Text – and You Have to Do Text Anyway
Images are Often Blocked
Looks Less Like a One-to-One Message
but you can avoid most of the html email problems .
here you can build your own custom responsive email templates