DKIM, which is an abbreviation for DomainKeys Identified Mail, is an email validation system, which blocks email headers from being spoofed and email content from being manipulated. This is achieved by adding an electronic signature to each email message sent from an email address under a particular domain name. The signature is published on the basis of a private encryption key that’s available on the outbound SMTP server and it can be validated using a public key, which is available in the global Domain Name System. Thus, any email with edited content or a forged sender can be identified by email service providers. This approach will enhance your online security markedly and you will be sure that any e-mail message sent from a business collaborator, a bank, etc., is authentic. When you send out emails, the recipient will also know for sure that you are indeed the one who has sent them. Any email that appears to be forged may either be flagged as such or may never enter the recipient’s mailbox, based on how the given provider has decided to deal with such messages.