Dec 15, 2023: Information about macOS Sonoma 14.2 Mail Extension. Learn More

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.

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 Topics

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 Topics

Where is Letter Opener for macOS Mail installed?

Supported macOS versions

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

Contact support

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

support@winmail.help

Or use our contact form.