DKIM, which is an acronym for DomainKeys Identified Mail, is an email authentication system, which stops email headers from being forged and email content from being modified. This is achieved by attaching a digital signature to each email message sent from an address under a certain domain name. The signature is generated based on a private cryptographic key that’s available on the outbound mail server and it can be validated with a public key, which is available in the global DNS database. Thus, any email message with modified content or a forged sender can be spotted by email providers. This approach will heighten your web security noticeably and you’ll be sure that any email sent from a business ally, a bank, etc., is an authentic one. When you send out email messages, the recipient will also be sure that you are indeed the one who has sent them. Any mail that turns out to be counterfeit may either be flagged as such or may never enter the recipient’s inbox, based on how the particular provider has decided to cope with such messages.