Postbox 6.1.5 BETA 1



Postbox 6.1.5 BETA 1 is now available!

This updates Postbox to the Mozilla platform version 52.9.1, which contains several important fixes:

  • Several security fixes to address "efail" vulnerability
  • Security fix to prevent form submits via sandboxing
  • Fix to HTML rendering
  • Fix to remove plaintext tag from HTML
  • Fix for various forwarding issues
  • Fix to allow auto-compact to occur for IMAP folders when online
  • Fix to prevent corruptions when detaching or deleting attachments from messages

Please help us test this version by using it as you normally would, then let us know if you encounter any issues.

Installing 6.1.5 BETA 1

1) Quit or Exit from Postbox so that it is no longer running.

2) Download and install using these links:


Please let us know about any issues that you find on the Postbox BETA Feedback page. 

(While we appreciate each submission, and we receive thousands, please note that we cannot respond to the comments you submit.)


Thanks very much for helping us test this new release!

- The Postbox Team