App accidentally tampered with the Mail application resources file, will not be open.

I use a Macbook Air in 2015, I tried to clear up space on my disk hard when I moved the folder "Resource" in the Mail app package content to the trash. Realizing it was a mistake, I put it back where I found it only to find out that the app does not at all open (the icon looks like as shown). Is there something I can do?

Restore OS X using OS X Recovery.

As you have discovered, it is best not to delete system files.

Tags: Mac OS & System Software

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