frm_check_blacklist

add_filter( 'frm_check_blacklist', '__return_false' );

If you need to disable the blacklist check for only one form, you can use this example.

add_filter( 'frm_check_blacklist', 'limit_check_blacklist', 10, 2 );
function limit_check_blacklist($check, $atts){
	if ( $atts['form_id'] == 25 ) { //replace 25 with the id of the form you would like to disable the blacklist check on.
		$check = false;
	}
	return $check;
}