DomainKeys Identified Mail, or DKIM, is a method for validating the genuineness of an email by using a digital signature. When DKIM is enabled for a specific domain name, a public key is published to the global DNS database and a private one is kept on the mail server. If a new message is sent, a signature is issued using the private key and when the email is received, the signature is verified by the POP3/IMAP mail server using the public key. Thus, the receiver can easily distinguish if the email message is legitimate or if the sender’s email address has been spoofed. A discrepancy will occur if the content of the email message has been altered in the meantime as well, so DomainKeys Identified Mail can also be used to make sure that the sent and the delivered email messages are identical and that nothing has been attached or erased. This email authentication system will strengthen your email security, since you can verify the genuineness of the important emails that you receive and your partners can do the same with the email messages that you send them. Depending on the particular email provider’s adopted policies, a message that fails the examination may be erased or may reach the receiver’s inbox with a warning alert.