使用 API/SMTP 检查方法，通过昵称查找现有的电子邮件地址，无需用户通知。请积极改进这个任务！ 🐱🔎 📬
Find existing email addresses by nickname using API/SMTP checking methods without user notification. Please, don't hesitate to improve cat's job! 🐱🔎 📬
