How to disable automated E-Mail on PHP error/exception?

There was some discussion on it a few weeks ago you can find here:
https://make.wordpress.org/core/2019/04/16/fatal-error-recovery-mode-in-5-2/

According to that and looking through the core, you can accomplish that with one of two methods:

define('RECOVERY_MODE_EMAIL', '[email protected]');

OR

add_filter( 'recovery_mode_email', 'recovery_email_update', 10, 2 );
  function recovery_email_update( $email, $url ) {
    $email['to'] = '[email protected]';
    return $email;
 }

Hope that helps!!