Top Alternatives to Mailspring

Microsoft Outlook is a personal information manager from Microsoft.

Mailbird is a desktop email client for Windows 7, 8 and 10.

Apple Mail is an email client included with the operating systems macOS, iOS and watchOS by Apple Inc.

eM Client is a Windows based e-mail client for sending and receiving e-mails, managing calendars, contacts, and tasks.

K-9 Mail is an open source email client with support for multiple accounts, search, IMAP push email, multi-folder sync, flagging, filing, signatures.

Evolution is the official personal information manager for GNOME.

Postbox is powerful, intuitive, ultra-customizable, speedy task manager.

Geary is an email application built around conversations, for the GNOME 3 desktop. It allows you to read, find and send email.

The Bat! is an email program for Windows that protects the correspondence and empowers the users to handle large amounts of emails quickly and efficiently.

Airmail is a fast mail client for Mac and iPhone.

Zimbra Desktop is an offline client that lets you manage various email accounts in one desktop tool.

OpenProject is a web-based project management system for location-independent team collaboration.

KMail is the email component of Kontact, the integrated personal information manager from KDE.

Spark is a fast, smart mail manager app.