DomainKeys Identified Mail, or DKIM, is a system for confirming the genuineness of an email by using an electronic signature. When DomainKeys Identified Mail is enabled for a specific domain name, a public cryptographic key is published to the global DNS database and a private one is kept on the email server. If a new message is sent, a signature is issued using the private key and when the email message is received, the signature is ‘scanned’ by the POP3/IMAP mail server using the public key. Thus, the recipient can easily know if the email message is genuine or if the sender’s address has been spoofed. A discrepancy will occur if the content of the email has been changed in the meantime as well, so DomainKeys Identified Mail can also be used to ensure that the sent and the delivered emails are identical and that nothing has been added or removed. This authentication system will strengthen your email safety, as you can verify the legitimacy of the important email messages that you receive and your colleagues can do the same with the emails that you send them. Depending on the given mail service provider’s policy, an email that fails the check may be erased or may be delivered to the recipient’s mailbox with a warning symbol.