DomainKeys Identified Mail, or DKIM, is a method for checking the genuineness of an email using an electronic signature. When DomainKeys Identified Mail is activated for a specific domain, 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 message is sent, a signature is generated using the private key and when the email message is received, the signature is validated by the incoming POP3/IMAP server using the public key. In this way, the receiver can easily know if the email message is genuine or if the sender’s email address has been spoofed. 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 make sure that the sent and the received email messages are identical and that nothing has been added or deleted. This email authentication system will strengthen your email safety, since you can verify the genuineness of the important email messages that you get and your partners can do the exact same thing with the email messages that you send them. Depending on the given email service provider’s adopted policies, a message that fails the examination may be erased or may reach the receiver’s inbox with a warning alert.