Support – Letter Opener for macOS Mail

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


Getting Started

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

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Purchase Information

How to license Letter Opener for macOS Mail

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Letter Opener banner

How to customise Letter Opener for macOS Mail

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Troubleshoot Topics

No attachments are shown

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

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Winmail.dat file is not converted

Letter Opener doesn’t seem to be converting files.

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Incompatible Plug-in disabled

Error message upon starting Mail

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

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

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Uninstall Letter Opener

In a southern austrian accent: Ohh! We’re sorry to see you go!

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Technical Topics

Where is Letter Opener for macOS Mail installed?

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Supported macOS versions

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

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Contact Support

How can we help you?

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