DomainKeys Identified Mail, or DKIM, is a method for confirming the authenticity of an email message using an electronic signature. When DomainKeys Identified Mail is activated for a particular domain name, a public key is published to the global Domain Name System and a private one is kept on the email server. When a new email is sent, a signature is generated using the private key and when the email message is delivered, that signature is validated by the incoming POP3/IMAP mail server using the public key. Thus, the receiver can easily distinguish if the message is genuine or if the sender’s address has been spoofed. A discrepancy will appear if the content of the email message has been altered on its way as well, so DKIM can also be used to make sure that the sent and the received emails are identical and that nothing has been added or removed. This validation system will strengthen your email security, since you can confirm the genuineness of the important emails that you receive and your partners can do the same with the emails that you send them. Based on the given email service provider’s adopted policies, a message that fails the check may be erased or may enter the recipient’s mailbox with a warning sign.