Postbox is a slick, modern-looking email client that provides a rich set of tools to help you get more from your messages. Postbox helps you make the most of your email, offering powerful new ways to find, use, and view email messages and content, organize your work life, and get stuff done.
Postbox features include:
Postbox 6.1.0 changelog:
Support macOS Contacts Distribution Lists
Fixed searching base64 encoded message bodies in Advanced Search panel
Fixed several crashing bugs
Download: Postbox 6.1.0 | 45.2 MB (Shareware)
Links: Postbox Home Page | Postbox for macOS | Screenshot