As we're big fans of MailChimp at Doepud we rarely need to stray beyond the tried-and-tested solutions we know work without fail but every now and then we need to dip our toes into the hazardous Loch HTML and the loss of a limb often offends. Thankfully An Introduction To Building And Sending HTML Email For Web Developers over at Smashing Magazine has you covered. There's a swathe of useful tips that cover Client-Rendering Engines, styling call-to-action buttons, typography using conditional CSS and Responsive Email Design.