Alternatives to Sfletter for all platforms with any license

Tutanota

Tutanota is a free and open source web-mail client that focuses on privacy and security. It has open source iOS and an Android apps. The Android app is published on...

Free Personal $ $ $ Open Source Web Android iPhone iPad F-Droid
Encrypted Email Privacy focused End-to-End Encryption Night mode/Dark Theme ... Custom domain Encrypted Email Privacy Protected Anonymity Clean design Encrypted calendar Encrypted Connection Encryption Integrated File Sharing Multiple Account support Web-Based Add a feature

281 Like
mailbox.org

mailbox.org offers a secure e-mail account for home and business use. The domain name, me@mailbox.org, is easy to remember and can be understood anywhere in the world....

Commercial $ $ $ Web
Built-in Calendar Custom domain Encrypted Email Privacy focused ... Security & Privacy CalDAV CardDAV Contacts Ad-free Encrypted Email Gpg encryption Support for IMAP PGP Encryption Self destructing messages Supports XMPP Two factor authentication Add a feature

36 Like
Shazzlemail

ShazzleMail is the first privacy-protective and surveillance-resistant secure email service.

Free Personal Mac Windows Linux Android iPhone
Self destructing messages Add a feature

3 Like
SCRYPTmail

SCRYPTmail is true end-to-end encrypted email service. Email and meta data, i.e sender / recipient are encrypted when you communicate within scryptmail domain. ...
- Discontinued
  Service closing, see https://blog.scryptmail.com/discontinuing-of-service/
Freemium Web
Anonymity Encrypted Email End-to-End Encryption Web-Based Add a feature

9 Like
Runbox

(Official description) Runbox provides secure email communication with Perfect Forward Secrecy SSL connections, Extended Validation, and options for...

Commercial $ $ $ Web OpenPGP
Support for IMAP CardDAV Encrypted Email Two factor authentication Add a feature

3 Like
EveryCloud

EveryCloud’s cloud based spam filtering service blocks 99.99% of spam, viruses and even newsletters if required. Set spam reports to give users control and view 90 days...

Commercial Web
Email Archiving Filtering Add a feature

3 Like
Secure Exchanges

Secure Exchanges is a SaaS that enables point-to-point encrypted email exchange without the recipient having to install anything. It allows you to send emails and files...

Commercial $ $ $ Mac Windows Linux NuGet Microsoft Office Outlook ... .NET Framework Context Chrome Extension Software as a Service (SaaS) Gmail
Outlook integration Gmail integration Notifications Protected by Password ... REST API Software as a Service White-labeled Google Chrome Extensions Encrypted Email Encryption End-to-End Encryption Security & Privacy Self destructing messages SMTP Add a feature

1 Like
Lockbin

Lockbin is a web application for sending private email messages and files. People use it to send things like credit card numbers or confidential information.

Freemium Mac Windows Linux Android Android Tablet
Encrypted Email Add a feature

4 Like
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Encipher.it

Encrypting email with Encipher.it is a simple way to protect your sensitive data. You can encrypt emails or text messages and only the recipient can decrypt it with...

Free Open Source Windows Linux Web Chrome
Google Chrome Extensions Encrypted Email Encryption Gmail integration ... Outlook integration Add a feature

1 Like
Sendinc

Secure email made simple Sendinc enables anyone to send and receive military-grade encrypted email in minutes and requires no special technical expertise. There is...

Commercial Web
Encrypted Email Self destructing messages Add a feature

1 Like