I had the questionable pleasure of developing our first HTML emails at work this week, and found the following links helpful. I ended up working from the refere

I had the questionable pleasure of developing our first HTML emails at work this week, and found the following links helpful. I ended up working from the reference provided in the first (A list apart article) link post https://github.com/alistapart/salted https://github.com/alistapart/salted . http://alistapart.com/article/can-email-be-responsive http://alistapart.com/article/can-email-be-responsive Which CSS is supported: https://www.campaignmonitor.com/css/ https://www.campaignmonitor.com/css/ How to serve images: https://sendgrid.com/blog/embedding-images-emails-facts/ https://sendgrid.com/blog/embedding-images-emails-facts/ General guides and some templates: https://www.campaignmonitor.com/guides/coding/guidelines/ https://www.campaignmonitor.com/guides/coding/guidelines/ http://templates.mailchimp.com/ http://templates.mailchimp.com/