Support – Letter Opener for macOS Mail

All the topics, resources, and contact options you need for Letter Opener.

Basics


Getting Started

How to install Letter Opener for macOS Mail and how it works.

Learn more


Manage Mail Extensions

How to activate Letter Opener in macOS Mail.

Learn more


Letter Opener in macOS Mail

How to activate Letter Opener in macOS Mail.

Learn more


Purchase Information

How to license Letter Opener for macOS Mail

Learn more


Letter Opener banner

How to customise Letter Opener for macOS Mail

Learn more

Troubleshoot Topics


No attachments are shown

A file was converted but it only shows text and no attachments.

Learn more


Winmail.dat file is not converted

Letter Opener doesn’t seem to be converting files.

Learn more


Incompatible Plug-in disabled

Error message upon starting Mail

Learn more


Can’t be opened because it was not downloaded from the App Store

“‘Install Letter Opener.pkg’ can’t be opened”

Learn more


License code not working

The license code doesn't unlock the current version of Letter Opener

Learn more


Uninstall Letter Opener

In a South Austrian accent: Aww! We’re sorry to see you go!

Learn more

Technical Topics


Where is Letter Opener for macOS Mail installed?

Learn more


Supported macOS versions

Detailed table of macOS versions and the matching Letter Opener version.

Learn more


Contact support

Please note that we can only answer support requests in English language.
support@winmail.help

Or use our contact form.