Apple mail message list font size greyed out

The pesky greyed-out font size option in Apple Mail!

This issue is usually caused by a bug or a quirk in the Mail app. Here are a few troubleshooting steps to help you resolve the issue:

  1. Restart Mail: Sometimes, a simple restart of the Mail app can resolve the issue. Quit Mail, reopen it, and check if the font size option is no longer greyed out.
  2. Check for updates: Ensure that your Mac is running the latest version of macOS and that Mail is updated to the latest version. You can check for updates in the App Store or through System Preferences > Software Update.
  3. Reset Mail settings: Resetting Mail settings can sometimes resolve issues like this. To do this, go to System Preferences > Mail, Contacts, Calendars, and click on "Reset" at the bottom of the window. This will reset all Mail settings to their default values.
  4. Check font settings: Ensure that the font settings in System Preferences > General are set to a font size that is not too small. If the font size is set to a very small value, it may cause the font size option in Mail to be greyed out.
  5. Try a different font: Try changing the font used in Mail to a different one. You can do this by going to Mail > Preferences > Fonts & Colors, and selecting a different font from the dropdown menu.
  6. Check for conflicts with other apps: Sometimes, another app may be interfering with Mail's font size option. Try closing all other apps and see if the issue persists.
  7. Reinstall Mail: If none of the above steps work, you can try reinstalling Mail. To do this, go to the App Store, search for Mail, and click "Install" to reinstall the app.

If none of these steps resolve the issue, you may want to try searching online for more specific solutions or reaching out to Apple Support for further assistance.