DomainKeys Identified Mail, or DKIM, is a method for validating the authenticity of an email message by using a digital signature. When DomainKeys Identified Mail is enabled for a certain domain, a public encryption key is published to the global DNS system and a private one is stored on the mail server. When a new email message is sent, a signature is issued using the private key and when the message is received, that signature is verified by the POP3/IMAP email server using the public key. Thus, the recipient can easily distinguish if the email is legitimate or if the sender’s email address has been forged. A discrepancy will occur if the content of the email has been changed in the meantime as well, so DKIM can also be used to ensure that the sent and the delivered email messages are identical and that nothing has been added or erased. This validation system will increase your email safety, as you can validate the authenticity of the important emails that you receive and your colleagues can do the same with the messages that you send them. Depending on the given email provider’s adopted policy, an email message that fails the examination may be deleted or may appear in the recipient’s mailbox with a warning.