DomainKeys Identified Mail, or DKIM, is a system for validating the genuineness of an email message by using an electronic signature. When DomainKeys Identified Mail is activated for a certain domain name, a public 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 generated using the private key and when the email message is received, that signature is authenticated by the POP3/IMAP email server using the public key. In this way, the receiver can easily distinguish if the email message is genuine or if the sender’s email address has been spoofed. A discrepancy will appear if the content of the email message has been edited on its way as well, so DKIM can also be used to make sure that the sent and the delivered email messages are identical and that nothing has been added or erased. This email authentication system will heighten your email safety, since you can validate the authenticity of the important email messages that you receive and your partners can do likewise with the messages that you send them. Depending on the given email service provider’s adopted policy, an email that fails to pass the examination may be removed or may emerge in the receiver’s mailbox with a warning sign.