DomainKeys Identified Mail, or DKIM, is a method for confirming the genuineness of an email using an electronic signature. When DomainKeys Identified Mail is enabled for a specific domain, a public encryption key is published to the global DNS database and a private one is kept on the mail server. When a new email is sent, a signature is issued using the private key and when the email is delivered, that signature is authenticated by the incoming POP3/IMAP server using the public key. Thus, the recipient can easily distinguish if the email is authentic or if the sender’s email address has been forged. A discrepancy will occur if the content of the email has been edited on its way as well, so DomainKeys Identified Mail can also be used to make sure that the sent and the delivered emails are identical and that nothing has been attached or erased. This authentication system will strengthen your email security, as you can confirm the authenticity of the important email messages that you receive and your colleagues can do the exact same thing with the emails that you send them. Based on the given email provider’s adopted policy, a message that fails the examination may be removed or may be delivered to the receiver’s mailbox with a warning symbol.