MailspringMailspring 
The latest version of Mailspring is 1.16 on Mac Informer. It is a perfect match for E-mail in the Communication category.
All-in-one email productivity app for faster multi-account management
Mailspring is a powerful desktop email client that connects all your e-mail accounts in one unified inbox. Save time, stay organized, and streamline your day with seamless access to Gmail, iCloud, Office 365, Outlook.com, Yahoo!, and IMAP/SMTP in a single place — perfect for multi-account email management and busy professionals.
Enjoy advanced organization, unlimited custom signatures, and a clean interface that boosts focus. Whether you work remotely or in an office, this best email productivity app keeps your communication fast, synchronized, and secure.
• One unified inbox for every account — manage Gmail, iCloud, Office 365, Outlook.com, Yahoo!, and IMAP/SMTP together • Create unlimited custom email signatures and use them across all accounts • Modern, streamlined desktop email client for professionals and teams • Faster workflow with smart organization tools and a polished interface • Reliable performance designed for high-volume daily email users and business productivity
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