Best The Bat! Professional Alternatives & Competitors

Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response

Mailspring is a mail client for Mac, Windows and Linux.

Open Source

The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.

Visit website paid $19.5 / Monthly (Pro)

Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

The Power Email App for busy professionals, like you.

Secure email with absolutely no compromises. Get your free encrypted email account today.

freemium €5.0 / Monthly (user - 5 GB)

Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.

Hiri is the best email client for Managers on Windows, Mac and Linux.

Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA).

eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.

freemium

Mailbird is the best email client for Windows 7, 8 and 10

Get your encrypted mailbox for free.

Open Source

Starting with version 0.9.8, mu provides an emacs-based e-mail client which uses mu as its back-end: mu4e.

Mail and Calendar is an email client by Microsoft that comes bundled inside the Windows 10.