DomainKeys Identified Mail, or DKIM, is a system for validating the genuineness of an email using an e-signature. When DKIM is activated for a particular domain name, a public encryption key is published to the global Domain Name System and a private one is kept on the mail server. When a new email is sent, a signature is generated using the private key and when the email message is delivered, the signature is verified by the POP3/IMAP server using the public key. Thus, the recipient can easily tell if the message is authentic or if the sender’s email address has been forged. A discrepancy will appear if the content of the email has been altered in the meantime as well, so DKIM can also be used to make sure that the sent and the received messages are identical and that nothing has been attached or erased. This validation system will boost your email safety, since you can confirm the legitimacy of the important emails that you get and your colleagues can do the same with the emails that you send them. Depending on the particular mail service provider’s adopted policy, a message that fails the examination may be deleted or may show up in the receiver’s mailbox with a warning.