This document provides technical tips and recommendations for developing HTML emails. It discusses how HTML for emails is different than for the web due to inconsistent CSS support across email clients, and recommends using HTML tables for layout. It outlines elements that are supported in various email clients like images, forms, video, animated GIFs and JavaScript. It also provides tools for creating HTML emails and specific guidelines for optimizing emails for Outlook 2007, Lotus Notes, Hotmail, Gmail and Yahoo. The document recommends resources and design services from ExactTarget.