DomainKeys Identified Mail, or DKIM, is a method for confirming the legitimacy of an email message by using an electronic signature. When DKIM is activated for a particular domain name, a public encryption key is published to the global DNS system and a private one is kept on the mail server. If a new message is sent, a signature is generated using the private key and when the email message is received, that signature is checked by the receiving server using the public key. Thus, the recipient can easily tell if the email message is authentic or if the sender’s address has been forged. A discrepancy will appear if the content of the email has been modified on its way as well, so DomainKeys Identified Mail can also be used to make sure that the sent and the delivered messages are identical and that nothing has been attached or deleted. This email authentication system will boost your email safety, since you can confirm the legitimacy of the important emails that you receive and your associates can do likewise with the email messages that you send them. Depending on the particular mail service provider’s adopted policies, a message that fails the test may be removed or may show up in the receiver’s mailbox with a warning symbol.