Open source Fastmail alternatives

All Fastmail alternatives

1. 

   

   Proton Mail

   4.8(48.7K) · App StoreLike

   Proton Mail is an end-to-end encrypted email service based in Switzerland. Messages between Proton users are encrypted automatically, emails to others can be password-protected, and stored mail uses zero-access encryption so Proton cannot read it. Its apps are open source, paid plans add custom domains and more addresses, and it is part of a suite with Proton Calendar, Drive, VPN and Pass.

   9 Proton Mail alternatives

   Pros

   • End-to-end and zero-access encryption protect stored mail
   • Based in Switzerland, with open source apps
   • Part of a suite with Proton Calendar, Drive, VPN and Pass

   Cons

   • Free plan is tight on storage and addresses
   • Using IMAP clients requires Proton Mail Bridge and a paid plan

   Cost / License

   FreemiumOpen source

   Categories

   Email Clients & Providers

   Platforms

   WebWindowsMacLinuxiPhoneAndroid

   Features

   Custom email domainEmail aliasesEnd-to-end encryptionSend laterTracker blockingTwo-factor authentication

   Visit websiteMore about Proton Mail
2. 

   

   Tuta

   4.7(3.7K) · App StoreLike

   Tuta, formerly Tutanota, is an open-source encrypted email and calendar service based in Germany. It encrypts mailbox contents end to end, including subject lines and contacts, and uses post-quantum cryptography for new accounts. Because it relies on its own encryption, it works through Tuta's apps rather than IMAP clients. A free plan exists, and paid plans add custom domains and more aliases.

   7 Tuta alternatives

   Pros

   • Encrypts subjects and contacts, not just message bodies
   • Post-quantum cryptography for new accounts
   • Open source apps and a free plan, with servers in Germany

   Cons

   • No IMAP support, so you must use Tuta’s own apps
   • Free plan is limited in storage and features
   • Fewer integrations and features than mainstream providers

   Cost / License

   FreemiumOpen source

   Categories

   Email Clients & Providers

   Platforms

   WebWindowsMacLinuxiPhoneAndroid

   Features

   Calendar viewCustom email domainEmail aliasesEnd-to-end encryptionGDPR compliant

   Visit websiteMore about Tuta
3. 

   

   Thunderbird

   Like

   Thunderbird is a free and open-source email client for Windows, macOS and Linux, with an Android app based on K-9 Mail. It manages multiple accounts in a unified inbox and includes a calendar, address book, chat and built-in OpenPGP encryption. Add-ons and themes customize it extensively, and it is developed by MZLA Technologies, a Mozilla Foundation subsidiary funded by user donations.

   9 Thunderbird alternatives

   Pros

   • Free and open source, funded by donations rather than ads
   • Built-in OpenPGP encryption, calendar and address book
   • Highly customizable with add-ons and themes

   Cons

   • Interface feels busier than minimalist modern clients
   • Getting the most out of it takes some setup and add-ons

   Cost / License

   FreeOpen source

   Categories

   Email Clients & Providers

   Platforms

   WindowsMacLinuxAndroid

   Features

   Ad-freeCalendar viewEnd-to-end encryptionOffline modePlugins & extensionsUnified inbox

   Visit websiteMore about Thunderbird