To install the mail icon is easy, it's really just a matter of moving a few files, and yes the dots still work.
Mail app cannot be running as you do this.
First Control (right if you have a 2 button mouse) click on the Mail icon & select 'Show Package Contents' from the menu.
navigate through the window that opens, through 'Contents', 'Resources'.
In here find the 'app.icns' file and copy it somewhere safe, as a backup.
As there is 3 different syles of mail icon in the .sit file, you will nead to alter the name of the one you want to use to just 'app.icns'.
replace the original 'app.icns' file still in the Mail app package with the new replacement.
To get the dock icon to update to the new one you need to drag mail app out of the dock and put it back in.
Mail app cannot be running as you do this.
First Control (right if you have a 2 button mouse) click on the Mail icon & select 'Show Package Contents' from the menu.
navigate through the window that opens, through 'Contents', 'Resources'.
In here find the 'app.icns' file and copy it somewhere safe, as a backup.
As there is 3 different syles of mail icon in the .sit file, you will nead to alter the name of the one you want to use to just 'app.icns'.
replace the original 'app.icns' file still in the Mail app package with the new replacement.
To get the dock icon to update to the new one you need to drag mail app out of the dock and put it back in.