Email Marketing

MailChimp (http://www.mailchimp.com/ is my favorite bulk email sending service. Very simple. Just upload your email list, upload your HTML and send. It tracks detailed stats for all of your campaigns and holds onto them forever.

Litmus (http://www.litmusapp.com) allows you to test your websites or HTML email messages in practically every web browser and email client currently in use. You just put in a link to the site, or upload your HTML, and their engine renders the code in all the different programs and takes screenshots which you can easily flip through.

Unfortunately this service is not free, costing $50 a month, but it is well worth the price. Useful for web developers, indispensable for email marketers.

This website keeps track of all the email clients and how well they support HTML messages. Gives detailed lists of all the bugs for each, which can be helpful to reference when you are having a problem you can’t seem to fix. Very useful for email marketers.
http://www.email-standards.org/clients/