DKIM, which is an acronym for DomainKeys Identified Mail, is an email validation system, which prevents email headers from being spoofed and email content from being modified. This is done by attaching an electronic signature to every email sent from an email address under a particular domain. The signature is published on the basis of a private key that is available on the sending server and it can be verified with a public key, which is available in the global DNS database. Thus, any email with altered content or a spoofed sender can be identified by email providers. This method will boost your online safety noticeably and you will know for sure that any email sent from a business collaborator, a bank, etc., is a legitimate one. When you send emails, the recipient will also be sure that you are indeed the one who has sent them. Any email that turns out to be fake may either be labeled as such or may never show up in the receiver’s mailbox, depending on how the particular provider has decided to deal with such messages.