DomainKeys Identified Mail, or DKIM, is a method for validating the authenticity of an email using an electronic signature. When DKIM is enabled for a specific domain name, a public cryptographic key is published to the global DNS database and a private one is stored on the mail server. If a new email is sent, a signature is issued using the private key and when the email is delivered, the signature is ‘scanned’ by the POP3/IMAP email server using the public key. Thus, the recipient can easily distinguish if the email is genuine or if the sender’s email address has been spoofed. A mismatch will occur if the content of the email message has been modified on its way as well, so DomainKeys Identified Mail can also be used to ensure that the sent and the received messages are identical and that nothing has been added or deleted. This email validation system will increase your email security, since you can verify the genuineness of the important emails that you receive and your colleagues can do the same with the emails that you send them. Based on the particular mail service provider’s policies, a message that fails to pass the examination may be erased or may emerge in the receiver’s mailbox with a warning.