Mailbird for Mac

As of July 2012, Thunderbird has transitioned to a new governance model, with new features being developed by the broader free software and open source community, and security fixes and improvements handled by Mozilla.

Microsoft Outlook is an email client with useful productivity features such as calendar and task management. It supports connecting to various types of email accounts, including Exchange, Gmail and Yahoo Mail.

Airmail 2.5 is a new mail client designed for OS X 10.10 Yosemite with fast performance and intuitive interaction. Support for iCloud, MS Exchange, Gmail, Google Apps, IMAP, POP3, Yahoo!, AOL, Outlook.com, Live.com.

GyazMail is an e-mail client that is developed from scratch to be a simple, easy-to-use e-mail client with many features, based on the Cocoa framework. This software will be distributed as shareware (undecided on details at this point).

MailMate is an ambitious, powerful email client for OS X. It is designed for and only supports IMAP while still working in full when offline. MailMate has state-of-the-art searching capabilities and correspondingly advanced smart mailboxes.

Mailsmith, the email client from the makers of BBEdit, is just as powerful and feature-rich as the text editor. It's a pity Mailsmith supports POP accounts only, and a — adequately empowering — rich-text editor could be a neat addition, too.

SweetMail is an Internet email client that supports a multiple pane window, toolbar button setting, more contextual menu support more assistant features, address book, and IMAP4 support.

Opera Mail is a lightweight, customizable mail client. The application allows you to view multiple emails messages at once and navigate between them with ease.

Howard is a mail client that notifies you about incoming messages on your personal account. You will receive subtle visual and audio notification whenever someone sends you a message, and you will have the chance to check it on the spot.

AlphaMail is a lightweight email client that presents your emails in a popover from the menu bar. Main features: - View list of newest emails. - View full email message (attachments supported). - Mark message read/unread. - Forward/Reply to message.