How do I filter invalid addresses in a group of U-mail mails?

The U-mail mass mailing platform can automatically filter out invalid and duplicate addresses. The filtering effect is as follows:

The U-mail mass mailing platform will add the customer who has confirmed that the address is invalid to the Invalid Address library. The next time you import and modify the Invalid Address, the system will directly reject it. If the email format is incorrect, it will be filtered out directly. For other items, You need to first query the mail MX record and the information fed back by the server when delivering the mail.

The implementation principle is as follows:

If you need to use the U-mail mass mailing platform, please consult our customer service QQ: 4008181568