Just to keep the momentum going from Stefan’s series on optimizing your e-mail messages, I thought I’d point out that the wonderful folks at our e-mail service provider “Campaign Monitor”:http://www.campaignmonitor.com/ recently published their own “Email Design Guidelines for 2006”:http://www.campaignmonitor.com/blog/archives/2005/11/html_email_desi.html.
They’ve used lots of real world examples that make the problems they (and Stefan) talked about very clear, so it is definitely worth a read.