Mail is Unable to Open a URL
Since upgrading to macOS 10.15, the mail app is no longer able to open a message by its URL.
For instance, the URL message:%3CCAEkAa-anCn=ZE21kpFw-oKaXEVsGE0SuuNtyUT8qyZndoPMuaQ@mail.gmail.com%3E which launched the corresponding message is now causing Mail app to show the following message:
The operation couldn’t be completed. (MCMailErrorDomain error 1030.)
Mail was unable to open the URL “message:%3CCAEkAa-anCn=ZE21kpFw-oKaXEVsGE0SuuNtyUT8qyZndoPMuaQ@mail.gmail.com%3E”.
Solution 1:
According to your error message it looks like a Mail plugin incompatibility. One or more plugins are not fully compatible with macOS 10.15 Catalina, yet. Did you install GPGMail.mailbundle or additional mail plugins? If so,
- Completely shut down Mail.app
- Navigate to
~/Library/Mail/Bundles - Move GPGMail.mailbundle to your desktop
- Restart Mail and try again