DomainKeys Identified Mail, or DKIM, is a method for checking the legitimacy of an email by using a digital signature. When DomainKeys Identified Mail is activated for a given domain, a public encryption key is published to the global DNS database and a private one is stored on the email server. If a new email is sent, a signature is issued using the private key and when the email is received, the signature is authenticated by the incoming POP3/IMAP email server using the public key. In this way, the recipient can easily discern if the email message is legitimate or if the sender’s address has been spoofed. A discrepancy will occur if the content of the email message has been changed in the meantime as well, so DKIM can also be used to ensure that the sent and the delivered emails are identical and that nothing has been attached or removed. This authentication system will strengthen your email safety, as you can verify the legitimacy of the important emails that you get and your partners can do the exact same thing with the emails that you send them. Depending on the given email provider’s policy, an email message that fails to pass the examination may be removed or may emerge in the recipient’s mailbox with a warning symbol.