DKIM, which is an acronym for DomainKeys Identified Mail, is a validation system, which hinders email headers from being forged and email content from being tampered with. This is done by adding an e-signature to each and every email message sent from an address under a particular domain. The signature is generated on the basis of a private key that is available on the outgoing SMTP email 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 recognized by email providers. This technology will heighten your online safety considerably and you’ll know for sure that any email sent from a business associate, a bank, and so on, is an authentic one. When you send out emails, the recipient will also know for sure that you are indeed the one who has sent them. Any email message that appears to be counterfeit may either be tagged as such or may never enter the receiver’s inbox, depending on how the particular provider has decided to deal with such emails.