DomainKeys Identified Mail, or DKIM, is a method for confirming the authenticity of an email message using a digital signature. When DomainKeys Identified Mail is activated for a certain domain name, a public encryption key is published to the global DNS system and a private one is stored on the email server. If a new email is sent, a signature is issued using the private key and when the message is delivered, the signature is authenticated by the incoming POP3/IMAP mail server using the public key. Thus, the receiver can easily know if the email is authentic or if the sender’s email address has been forged. A discrepancy will appear if the content of the email has been altered 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 attached or erased. This email authentication system will boost your email safety, since you can confirm the authenticity of the important emails that you get and your partners can do the exact same thing with the messages that you send them. Depending on the given mail service provider’s policy, a message that fails to pass the examination may be removed or may appear in the recipient’s inbox with a warning symbol.