Supported web browsers, operating systems, and email applications

To ensure the best experience using Hushmail, and to keep up to date on critical security updates, we recommend using the latest versions of our supported browsers, operating systems, and third-party email applications.

Web Browsers

  • Apple Safari (version 9 and up)
  • Google Chrome (version 50 and up)
  • Microsoft Internet Explorer (version 11) and Edge (version 40 and up)
  • Mozilla Firefox (version 52 and up) 

Operating Systems


  • Windows 10
  • Windows 8


  • High Sierra (10.13)
  • Sierra (10.12)
  • El Capitan (10.11)

Apple iOS:

  • iOS 8 and up

Email Applications

  • Apple Mail (version 9 and up)
  • Microsoft Outlook (2010 and up)
  • Thunderbird (version 52 and up)


These minimum requirements also apply to customers using our Secure Forms feature, as well as non-Hushmail recipients reading encrypted messages.