DomainKeys Identified Mail, or DKIM, is a system for confirming the authenticity of an email message by using an e-signature. When DKIM is activated for a given domain, a public key is published to the global DNS system and a private one is kept on the mail server. When a new email is sent, a signature is issued using the private key and when the email message is received, the signature is verified by the incoming POP3/IMAP mail server using the public key. Thus, the receiver can easily distinguish if the message is authentic or if the sender’s address has been spoofed. A mismatch will occur if the content of the email has been modified in the meantime 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 deleted. This email authentication system will strengthen your email safety, as you can confirm the genuineness of the important email messages that you get and your partners can do likewise with the messages that you send them. Based on the given email service provider’s policies, a message that fails the examination may be removed or may enter the receiver’s mailbox with a warning symbol.
