DomainKeys Identified Mail, or DKIM, is a method for verifying the genuineness of an email by using an e-signature. When DKIM is activated for a certain domain name, a public key is published to the global Domain Name System and a private one is stored on the mail server. If a new email is sent, a signature is issued using the private key and when the email message is received, the signature is checked by the POP3/IMAP server using the public key. Thus, the recipient can easily recognize if the email message is legitimate or if the sender’s address has been spoofed. A mismatch will appear if the content of the email has been altered on its way as well, so DKIM can also be used to make sure that the sent and the received emails are identical and that nothing has been attached or removed. This email validation system will enhance your email safety, since you can verify the genuineness of the important emails that you get and your partners can do likewise with the messages that you send them. Depending on the particular mail service provider’s policy, an email that fails to pass the check may be removed or may reach the recipient’s inbox with a warning alert.