instant mail

Speed up Mail.app.

The must have mail notifier for OS X.

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

MiniMail is a plugin for Apple's Mail application.

Widescreen Apple Mail Plugin

An extreme effective spam and virus filter for the Communigate Pro® mail server

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

Label maker with mail merge and barcode features.

Enterprise-class open source mail/calendaring client.

MailFX is a notifier which replaces (or complete) the sound warning of Mail OSX.