DomainKeys Identified Mail, or DKIM, is a method for validating the genuineness of an email message using an electronic signature. When DKIM is enabled for a certain domain name, a public cryptographic key is published to the global DNS system and a private one is stored on the mail server. If a new message is sent, a signature is issued using the private key and when the email message is delivered, the signature is authenticated by the POP3/IMAP mail server using the public key. Thus, the receiver can easily recognize if the email is authentic or if the sender’s address has been spoofed. A discrepancy will occur if the content of the email message has been altered in the meantime as well, so DKIM can also be used to make sure that the sent and the delivered emails are identical and that nothing has been attached or removed. This validation system will increase your email safety, since you can validate the legitimacy of the important emails that you get and your associates can do the same with the email messages that you send them. Depending on the particular mail service provider’s policy, an email message that fails the check may be removed or may enter the recipient’s inbox with a warning sign.