there are subtle differences in how email clients render HTML emails with a variety of doctype declarations... Or no doctype at all.

the folks over at Campaign Monitor discovered a rather startling fact - anchor links aren't working as reliably as they originally thought in a number of popular email clients. This could be a rather major design issue if your email newsletters and templates contain a table of contents (TOC), or 'Back to top' -style links.

Administrative messages are the unloved stepchild of email marketing. The order confirmation, shipping notices, welcome emails etc. are often setup using default designs and text written by a software engineer…and never looked at again. Which is a lost opportunity when you consider just how much attention these emails get.

marketers rate social media as the online marketing channel with the greatest positive effect when integrated with email