Email template is hard

Email template is hard as there are tons of email client from mobile, desktop and browsers. We need use old school table design and inline CSS with a comprehensive compatibility table to cover different email clients.

We need tools and services to help Email template building. We also need best practice and Email boilerplate when writing Email templates.

http://emailchecklist.org/
http://emailclientmarketshare.com/

outline is unsupported
max-width is unsupported
unaligned td cell is unsupported
3-character hex code is unsupported
style tag in head is unsupported
display is unsupported
Subject limit to 25 characters

Typical structure is one big background table, then one div, then one main table, and nested tables if needed. So table, tr, td and div are the main elements used in Email templates.