Support – Letter Opener for macOS Mail
All the topics, resources, and contact options you need for Letter Opener.
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”
Uninstall Letter Opener
In a southern austrian accent: Ohh! We’re sorry to see you go!