Nylas Mail is an open-source desktop email client by Nylas, known for its emphasis on user-contributed extensions.

A web tool to check and validate the markup of HTML emails and newsletters.

Delightfully simple postcard and letter marketing. Design, mail & track personalized direct mail postcards and letters. Digital marketers use Mailjoy to send data-driven direct mail marketing campaigns. Mailjoy provides a ton of features to help you create mailing lists from your contacts, design beautiful mailers, track conversions, and integrate with the tools you already use. Sending a campaign takes only minutes. Use Mailjoy for a single campaign or make it a part of your marketing toolkit.