DKIM, which is an acronym for DomainKeys Identified Mail, is a validation system, which stops email headers from being spoofed and email content from being modified. This is done by adding a digital signature to each message sent from an email address under a given domain. The signature is generated on the basis of a private key that’s available on the outgoing 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 forged sender can be identified by mail service providers. This method will heighten your online safety enormously and you’ll know for sure that any e-mail sent from a business collaborator, a bank, and so on, is a legitimate one. When you send out email messages, the receiver will also be sure that you are indeed the one who has sent them. Any mail that appears to be forged may either be tagged as such or may never reach the recipient’s mailbox, depending on how the particular provider has chosen to deal with such messages.