DKIM, which is an acronym for DomainKeys Identified Mail, is a validation system, which impedes email addresses from being forged and email content from being manipulated. This is achieved by attaching a digital signature to every email sent from an address under a specific domain. The signature is generated on the basis of a private encryption key that’s available on the outgoing SMTP mail server and it can be verified with a public key, which is available in the global Domain Name System. In this way, any email message with changed content or a spoofed sender can be spotted by mail service providers. This approach will enhance your online safety noticeably and you’ll be sure that any e-mail sent from a business partner, a banking institution, and so on, is an authentic one. When you send messages, the receiver will also be sure that you are indeed the one who has sent them. Any email message that turns out to be forged may either be flagged as such or may never enter the receiver’s mailbox, depending on how the particular provider has chosen to cope with such emails.