DomainKeys Identified Mail, or DKIM, is a method for checking the genuineness of an email message using an e-signature. When DomainKeys Identified Mail is enabled for a specific domain name, a public encryption key is published to the global Domain Name System and a private one is kept on the email server. If a new email is sent, a signature is generated using the private key and when the email message is received, that signature is checked by the incoming POP3/IMAP email server using the public key. In this way, the receiver can easily distinguish if the email is legitimate or if the sender’s email address has been forged. A mismatch will occur if the content of the email message has been edited in the meantime as well, so DKIM can also be used to make sure that the sent and the received messages are identical and that nothing has been added or removed. This email authentication system will boost your email security, since you can confirm the legitimacy of the important emails that you receive and your associates can do the exact same thing with the emails that you send them. Based on the given mail service provider’s adopted policies, an email message that fails the check may be erased or may end up in the receiver’s mailbox with a warning flag.