DKIM, which stands for DomainKeys Identified Mail, is a validation system, which hinders email addresses from being spoofed and email content from being modified. This is achieved by attaching an e-signature to every message sent from an address under a specific domain name. The signature is generated based on a private cryptographic key that is available on the outgoing SMTP email server and it can be verified by using a public key, which is available in the global DNS database. In this way, any email with edited content or a forged sender can be spotted by mail service providers. This approach will strengthen your online safety greatly and you will be sure that any email message sent from a business associate, a bank, etc., is genuine. When you send out email messages, the recipient will also know for sure that you are indeed the one who has sent them. Any email that appears to be fake may either be flagged as such or may never enter the recipient’s mailbox, depending on how the given provider has chosen to handle such email messages.