This is the most critical and the most influential. For example, if 200 of the 1,000 emails you send are invalid, the server will make a comment to see if you are sending mass emails, and you may be blacklisted by the service provider. Users will not receive your emails at all, and the result is fatal.

        Not only is it wasteful, but if your sending base contains a large number of invalid mailboxes, it will also lead to an overall drop in the open rate and conversion rate, which will greatly affect the results of the data. If your leader sees the open rate data is so low , there will be doubts about the effect of the EDM you do, which is the impact on the data.

        For target users, it is impossible for us to send emails only once. It is normal to use them repeatedly. If you have a large number of invalid mailboxes, the adverse consequences will only be superimposed again and again.

    At present, there are two detection methods on the market, one is a small amount of detection on a web page, and the other is a large-scale detection using a special tool.

    The disadvantage of web version detection is that it can only be detected one by one, which cannot be satisfied if you want to test in large quantities.

    The characteristic of the detection software is that it can be verified in large quantities, and there is no problem with several thousand at a time. Just like our EmailChecker can quickly detect tens of millions of email addresses    

    

        How to check if she exists. We all know that each mailbox is an account in the server, and each account corresponds to an IP address of the server. Then as long as the IP address corresponding to the mailbox server can be found from the mx record, it means that the mailbox account is real, and this is very simple.

    

        If the email account does exist, will it be possible to send and receive emails? Not necessarily, it also depends on whether the server behind her is normal. If there is a problem with the server, for example, the port cannot be connected, the request cannot be received, and the reply cannot be made, which will cause the account to fail to receive emails. So try to establish a connection with the server to see if she responds. How to check it is based on the SMTP protocol. When you want to send the edited email to the server, you must follow the SMTP protocol. The server will make a corresponding reply after receiving the corresponding instruction, so we follow this The protocol to simulate, try to send an email to the server to test her feedback, to determine whether she is working properly.