DKIM, which stands for DomainKeys Identified Mail, is an email authentication system, which blocks email addresses from being spoofed and email content from being meddled with. This is done by attaching an electronic signature to each email message sent from an email address under a particular domain. The signature is generated on the basis of a private cryptographic key that’s available on the SMTP mail server and it can be verified with a public key, which is available in the global DNS database. Thus, any email message with edited content or a spoofed sender can be spotted by mail service providers. This approach will boost your online safety tremendously and you’ll be sure that any email sent from a business associate, a banking institution, and so on, is legitimate. When you send emails, the recipient will also be sure that you are indeed the one who has sent them. Any email message that appears to be fake may either be marked as such or may never reach the receiver’s mailbox, based on how the given provider has chosen to cope with such emails.