Donation Form Email Check

add_filter('charitable_validate_donation_form_submission_email_check', 'charitable_test_for_email', 10, 2 );

function charitable_test_for_email( $valid, $submitted ) {

	$email = $submitted->get_submitted_value( 'email' );

	// Add your logic here to see if the email is valid or not.

	// Return false if not valid, otherwise let the validation continue by passing back $valid.

	// if ( something ) {

	// return false;

	// }

	// 

	return $valid;

}