The project strategy is modeled after Mozilla Firefox. Open SourceEmail ClientCalendar HaikuHomebrewChocolatey93 alternatives to Thunderbird Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client.Open SourceEmail ClientAndroidAndroid TabletF-DroidK-9 is an open source email client for Android with multi-folder sync, email signatures, Bcc-to-self, return-address.Learn more about K-9 MailK-9 Mail info, screenshots & reviewsAlternatives to K-9 Mail46 FiltersiPhoneWindowsAndroidAndroid + Open SourceLinuxShow more filters 2226ThunderbirdIs this a good alternative? Yes NoCopy a direct link to this comment to your clipboard Free.

Filter by these if you want a narrower list of alternatives or looking for a specific functionality of K-9 Mail. Suggest changesThis page was last updated K-9 Mail 289 Free Other interesting Windows alternatives to K-9 Mail are Microsoft Office Outlook, Spark Mail, Mailspring and Delta Chat.K-9 Mail alternatives are mainly Email Clients but may also be Calendar Apps or WebMail Providers. If that doesn't suit you, our users have ranked more than 25 alternatives to K-9 Mail and 19 are available for Windows so hopefully you can find a suitable replacement. The best Windows alternative is Thunderbird, which is both free and Open Source. K-9 Mail Alternatives for Windows: Top 10 Email Clients and similar apps | AlternativeTo (function()() Skip to main contentSkip to site searchPlatformsCategoriesOnlineWindowsAndroidMaciPhoneLinuxiPadAndroid TabletProductivitySocialDevelopmentBackupRemote Work & StudyLoginSign up HomeOffice & ProductivityK-9 MailAlternativesK-9 Mail Alternatives for WindowsK-9 Mail is not available for Windows but there are plenty of alternatives that runs on Windows with similar functionality.

K9 mail app