MailMate is described as 'IMAP e-mail client for Mac featuring extensive keyboard control, Markdown supported email composition, advanced search conditions and drill-down search links, equally advanced smart mailboxes, automatic signature handling, cryptographic encryption/signing' and is an app in the Office & Productivity category. There are more than 50 alternatives to MailMate for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and iPhone. The best alternative is Thunderbird, which is both free and Open Source. Other great apps like MailMate are Gmail (Free), Microsoft Office Outlook (Paid), Mailbird (Paid) and eM Client (Freemium).
Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response Graceful, and sophisticated interface Easy configuration, intuitive operation Abundant features Extensibility Robustness and stability
Postbox is an email application that helps you organize your work life and get stuff done. It has all the elegance and simplicity of Apple Mail, but with more power and flexibility to manage even the most demanding workloads.
Bring your workspace together into one unified app. It’s everything your team has been looking for in a productivity and messaging app, but easier, and all with your email. Welcome to the shortest path to done.
KMail is the email component of Kontact, the integrated personal information manager of KDE. Kontact is a personal information manager and groupware software suite for KDE. It supports calendars, contacts, notes, to-do lists, news, and email.
Kontact is the integrated Personal Information Manager of KDE. Kontact suite unites mature and proven KDE PIM applications under one roof. Thanks to the powerful KPart technology, existing applications are seamlessly integrated into one.