DKIM technology adds an encrypted digital signature to each email, and then compares it with the records in the legal Internet address database. When an e-mail is received, only the e-mail whose encrypted information matches the records in the database can enter the user's inbox. DKIM domain name key identification technology can check the integrity of e-mail and avoid modification by unauthorized people such as hackers.

DKIM domain name key authentication technology is based on the traditional key authentication method, which generates a pair of public key and private key. The sender's mail server uses the private key to attach a signature to the outgoing mail; When these messages arrive at the recipient's mail server, the recipient's mail server uses the public key to send a query from the DNS server to verify the legitimacy of the signature. In this way, the public key is used to verify the signature and the private key is used to sign the signature. Because the private key can't be guessed from the public key, when the signature doesn't pass the verification, it implies that the mail has not passed the correct signing procedure when it is sent, and it may be spam.

The DKIM function provided by the enterprise mailbox of the new website enables customers to add an encrypted digital signature to each email after using this function, which supports the recipients to compare with the records in the legal Internet address database. Because GMAIL, Yahoo, Sina, QQ and other large email systems will verify the receipt through DKIM, after configuring this function, the success rate of customers sending emails to large email systems at home and abroad can be greatly improved.