The first thing you'll notice is that there is absolutely no support for using an actual stylesheet. You can't externally reference a stylesheet or even add your CSS inside <style> tags. Just like Gmail, you'll have to move all your CSS inline to get a half decent result.

Mark Brownlow lists a number of email marketing info sources that you can't afford not to know about.

A jargon free introduction to the world of email delivery

There is also nothing more mind-numbing and action-halting than a list of 15 or more social-media and network logos lined up in the sidebar of an email or Web page. When presented with too many choices, most readers simply will not act.

Email marketer expectations and sophistication are increasing. Forrester's Q1 survey of 104 email marketers found that the number of email marketers using click-through data as a segmentation attribute grew to 51%, its highest level ever. Yet, the survey revealed that other proven tactics including testing, Web site behavioral integration, and the use of social targeting tactics within email remain low. Email marketers who employ segmentation strategies including the use of Web site behavior as well as humanizing offers with product review content and data are four to six times more effective than those marketers who blast the same message to every subscriber.

Jigsaw's Spamhaus blacklist entry is short and sweet: "Spam services: selling non-opt-in lists, including .gov addresses."

The Email Marketer's Club is organizing its very first webinar on October 6th. If you're a retailer or e-commerce player, you can't afford to miss this one!