A Responsive Email Framework from ZURB. Quickly create responsive HTML emails that work on any device & client. Even Outlook.

Catches mail and serves it through a dream.

MailCatcher runs a super simple SMTP server which catches any message sent to it to display in a web interface.

Email Blueprints is a collection of HTML email templates that can serve as a solid foundation and starting point for the design of emails.

This website and its sample code creates a template of sorts, absent of design or layout, that will help you avoid some of the major rendering problems with the most common email clients out there — Gmail, Outlook, Yahoo Mail, etc. While not plug and play (you know, you'll have to do some work ;-), it will provide some helpful examples and snippets that will keep your email design rendering as true-to-form as possible.

Designing an HTML email that renders consistently across the major email clients can be very time consuming. We've put together this guide to save you the time and frustration of figuring it out for yourself. With 24 different email clients tested, we cover all the popular applications across desktop, web and mobile email.

This page compares regular expressions that validate e-mail addresses in order to find the best one.

Test and track your emails. Email previews, analytics and spam filter testing.

Easily create beautiful, branded email marketing campaigns. Start by choosing one of our free HTML email templates and customize it in minutes.

The Email Standards Project is about working with email client developers and the design community to improve web standards support and accessibility in email. The project was formed out of frustration with the inconsistent rendering of HTML emails in major email clients.

HTML email design reference

sentenc.es is a personal policy that all email responses regardless of recipient or subject will be a pre-determined number sentences or less. It’s that simple.

Swift Mailer integrates into any web app written in PHP 5, offering a flexible and elegant object-oriented approach to sending emails with a multitude of features.

SquirrelMail is a standards-based webmail package written in PHP. It includes built-in pure PHP support for the IMAP and SMTP protocols, and all pages render in pure HTML 4.0 (with no JavaScript required) for maximum compatibility across browsers. It has very few requirements and is very easy to configure and install. SquirrelMail has all the functionality you would want from an email client, including strong MIME support, address books, and folder manipulation.

Dada Mail is a Contemporary Mailing List Manager, enabling you to easily run a verified mailing list that your subscribers can trust, right on your own website.

Open WebMail is a webmail system based on the Neomail version 1.14 from Ernie Miller. Open WebMail is designed to manage very large mail folder files in a memory efficient way. It also provides a range of features to help users migrate smoothly from Microsoft Outlook to Open WebMail.