Mailspring is an email client designed to boost productivity. It supports multiple accounts (IMAP and Office 365) and offers features such as advanced shortcuts, fast search, unified inbox, and read tracking.
The software also includes a customizable signature editor, theme support, email translation, and automatic spell check.
Additionally, with Mailspring Pro, you can track email opens and link clicks, use quick templates, and manage contacts with detailed profiles. The Pro version offers additional features for a monthly fee.