proton mail

Connect Apple Mail email to friends' Facebook profile pictures.

Downloads Web-based mail to a POP client.

Assists mail services administrators.

You can Preview new unread mail with MOAppsMailBoy

A e-mail merge, email extractor, data parser and all in one email utility

Speed up Mail.app.

Take control of your voice, video, IM, text, social media, e-mail, fax

Widescreen Apple Mail Plugin

Smart Mailboxes for your contacts in Mac OS X's Mail.

Enterprise-class open source mail/calendaring client.