DomainKeys Identified Mail, or DKIM, is a system for checking the genuineness of an email message using an electronic signature. When DKIM is enabled for a specific domain, a public key is published to the global DNS database and a private one is stored on the email server. If a new message is sent, a signature is issued 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 receiver can easily know if the email is genuine or if the sender’s email address has been spoofed. A mismatch will occur if the content of the email message has been modified on its way as well, so DKIM can also be used to make sure that the sent and the received email messages are identical and that nothing has been added or removed. This validation system will boost your email safety, as you can confirm the genuineness of the important email messages that you receive and your partners can do the same with the email messages that you send them. Based on the given email service provider’s policies, a message that fails the check may be removed or may be delivered to the recipient’s mailbox with a warning notification.