Angle Wang

My solution is using other flag to condition only execution once time. ``` const guards = this.getGuards(controller.metatype.prototype[key]).map( (guard) => { const prototype = guard['prototype'] ?? guard; const traceName = `Guard->${controller.name}.${controller.metatype.prototype[key].name}.${prototype.constructor.name}`;...

Actually, this action is like the [package](https://www.npmjs.com/package/email-check). There is no other way bypass spam block list unless you build your own mail server with it's own ip.