Thunderbird
Open Source
Thunderbird is a open source mail client developed and maintained by Mozilla foundation.
Apple Mail
Free
Apple Mail is an email client included with the operating systems macOS, iOS and watchOS by Apple Inc.
Sylpheed
Open Source
Sylpheed is an open-source e-mail client and news client licensed under the GPL.
Zimbra Desktop
Free Personal
Zimbra Desktop is an offline client that lets you manage various email accounts in one desktop tool.
Kontact - KMail
Open Source
KMail is the email component of Kontact, the integrated personal information manager from KDE.
Polymail
Freemium
Polymail is an email application for OS X and iOS known for its clean interface and additional features atop the Gmail platform.
MailMate
Commercial
MailMate is an IMAP email client for macOS featuring extensive keyboard control, Markdown integrated email composition, advanced search conditions.
Microsoft Office Outlook
Commercial
Microsoft Outlook is a personal information manager from Microsoft.
Airmail
Commercial
Airmail is a fast mail client for Mac and iPhone.
Mutt
Open Source
Mutt is a text-based email client for Unix-like systems.
OpenProject
Open Source
OpenProject is a web-based project management system for location-independent team collaboration.
Spark
Free
Spark is a fast, smart mail manager app.
Mailplane
Commercial
Mailplane is a Gmail client for Mac.
Compare Postbox with alternatives
Compare Thunderbird and Postbox and decide which is most suitable for you.
Compare Microsoft Office Outlook and Postbox and decide which is most suitable for you.
Compare Zimbra Desktop and Postbox and decide which is most suitable for you.
Compare OpenProject and Postbox and decide which is most suitable for you.
Compare Kontact - KMail and Postbox and decide which is most suitable for you.