Alternatives to Sfletter for all platforms with any license

  • ProtonMail icon


    Secure email with absolutely no compromises, brought to you by MIT and CERN scientists. Swiss Based ProtonMail is incorporated in...

    Open Source Web / Cloud Android iPhone iPad

  • Tutanota icon


    Tutanota is a free and open source web-mail client that focuses on privacy. There's also an Android and an iOS app. All data is...

    Open Source Web / Cloud Android iPhone iPad

  • icon offers a secure e-mail account for home and business use. The domain name,, is easy to remember and can be...

    Commercial Web / Cloud Windows Mobile Android iPhone Android Tablet iPad ... Kindle Fire

  • EveryCloud icon


    EveryCloud’s cloud based spam filtering service blocks 99.99% of spam, viruses and even newsletters if required. Set spam reports to...

    Commercial Web / Cloud

  • Lockbin icon


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

    Freemium Mac Windows Linux Android Android Tablet

  • SCRYPTmail icon


    SCRYPTmail is true end-to-end encrypted email service. Email and meta data, i.e sender / recipient are encrypted when you communicate...

    Freemium Web / Cloud

  • runbox icon


    Runbox provides secure email communication with Perfect Forward Secrecy SSL connections, Extended Validation, and options for PGP...

    Commercial Web / Cloud

  • Sendinc icon


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

    Commercial Web / Cloud

  • icon

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

    Free Web / Cloud

  • Walnut Secure Email icon

    Walnut Secure Email

    Walnut Secure Email is P2P, person to person or end to end secure mail application that protects all of end-user existing accounts...

    Commercial Windows Linux Android iPhone Blackberry Android Tablet ... iPad

  • Pictle

    Pictle is a simple, beautiful way to send secret images. After the image is viewed, it will be deleted.

    Free Web / Cloud

  • icon Discontinued

    Sending confidential information such as passwords, account information and other sensitive data in emails and IM is not necessarily...

    Free Web / Cloud Windows Mobile Android iPhone HP webOS Firefox OS

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  • Shazzlemail icon


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

    Free Personal Mac Windows Linux Android iPhone

Sfletter Comments

Perfect for PDF protection

Comment by StarAndrey
about Sfletter Mar 2015

I use it to protect my PDF files against leakage