How and where to set administrator's e-mail in Apache

If your system was not configured with administrator e-mail then on 500 Internal Server Error you will see the following message:

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, [no address given] and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

To set admin's e-mail open:

nano /etc/apache2/sites-available/yoursite.com.conf

and set

ServerAdmin [email protected]