DomainKeys Identified Mail, or DKIM, is a method for validating the genuineness of an email by using a digital signature. When DomainKeys Identified Mail is activated for a given domain name, a public cryptographic key is published to the global Domain Name System and a private one is kept on the email server. When a new email message is sent, a signature is generated using the private key and when the email message is delivered, that signature is authenticated by the POP3/IMAP email server using the public key. Thus, the recipient can easily know if the email message is genuine or if the sender’s email address has been forged. A discrepancy will occur if the content of the email message has been modified on its way as well, so DKIM can also be used to ensure that the sent and the received email messages are identical and that nothing has been added or removed. This validation system will increase your email security, as you can validate 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 provider’s adopted policy, an email that fails to pass the examination may be removed or may show up in the recipient’s inbox with a warning sign.