Comment 1 for bug 1711442

I cannot confirm this at this point, since it works for me as expected.

This is also a bit strange, since "unity-mail-url Home" is the default action for the Unity Mail icon. If the application is running, it will do what you tell it to do in settings - otherwise, it will call "unity-mail" for you.

It seems to me that in your case "unity-mail-url Home" does not start the application. Could you please try the following from the terminal (make sure you have at least one unread message in your inbox):

1. killall unity-mail
2. unity-mail-url Home

The second command should start Unity Mail and exit immediately, but leave the application running, so there should be no output, just a clean command prompt.