cannot open my emails

With the Mail Application completely closed ( not Active and minimized in Dock ).

Hold the SHIFT Key and click the Mail icon to launch the application in a Safe Mode

Does it launch?

Still having issues with Mail >>

1 - Restart in Safe Mode. This will perform a Disk Repair, clear cache files and only load Apple Software, extensions and fonts. The boot up will be slow and can take some time - Normal.

2 - Does the issue present in this mode ?

3 - Sometimes a Safe Boot followed by a Normal Boot will just put things right.

1 - there could be something in the main User Account playing up. To further isolate this - Set up users, guests, and groups on Mac. Then log out of the Main User account and log into the dummy account and test again if the issue persists.

2 - If the issue is present in the dummy account - then, this appears to be a System Wide issue on the computer.

3 - If after performing each of the above steps in the order that have been presents and still have issues - please advise for possible further assistance