DomainKeys Identified Mail, or DKIM, is a method for confirming the authenticity of an email message by using a digital signature. When DKIM is enabled for a particular domain name, a public cryptographic key is published to the global DNS system and a private one is kept on the mail server. If a new email is sent, a signature is issued using the private key and when the email is received, that signature is checked by the incoming email server using the public key. In this way, the recipient can easily recognize if the email is authentic or if the sender’s email address has been forged. A mismatch will appear if the content of the email has been modified in the meantime as well, so DomainKeys Identified Mail can also be used to make sure that the sent and the received email messages are identical and that nothing has been attached or deleted. This authentication system will boost your email security, since you can confirm the genuineness of the important emails that you get and your partners can do the same with the messages that you send them. Based on the given email service provider’s adopted policy, a message that fails the examination may be removed or may reach the recipient’s mailbox with a warning.