Getting Started
How to install Letter Opener for macOS Mail and how it works.
Support – Letter Opener For Macos Mail
Find help articles and troubleshooting guides for Letter Opener For Macos Mail.
Basics
Manage Mail Extensions
How to activate Letter Opener in macOS Mail.
Letter Opener in macOS Mail
How to activate Letter Opener in macOS Mail.
Purchase Information
How to license Letter Opener for macOS Mail
Letter Opener banner
How to customise Letter Opener for macOS Mail
Troubleshoot
No attachments are shown
A file was converted but it only shows text and no attachments.
Winmail.dat file is not converted
Letter Opener doesn’t seem to be converting files.
Incompatible Plug-in disabled
Error message upon starting Mail
Can’t be opened because it was not downloaded from the App Store
“‘Install Letter Opener.pkg’ can’t be opened”
License code not working
The license code doesn't unlock the current version of Letter Opener
Uninstall Letter Opener
*In a South Austrian accent*: Aww! We’re sorry to see you go!
Technical
Where is Letter Opener for macOS Mail installed?
Supported macOS versions
Detailed table of macOS versions and the matching Letter Opener version.
Still need help? Contact our support team.
support@winmail.help