Incompatible Plug-in disabled

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Install the latest version of Letter Opener

This message can appear after a system update and simply requires the latest version of Letter Opener.

Get the latest version from our download page.

Details

To ensure that Mail functionality is not compromised by outdated plug-ins, Mail disables plug-ins that are not updated.

We provide a newsletter to inform our costumers about important updates.

  1. Go to Mail > Letter Opener for macOS Mail > Newsletter Sign Up
  2. Enter your email address and click the Join button.

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Uninstall Letter Opener