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 modified. This is achieved by attaching a digital signature to each email sent from an address under a certain domain. The signature is issued on the basis of a private cryptographic key that is available on the outgoing SMTP server and it can be verified by using a public key, which is available in the global DNS database. In this way, any email with altered content or a spoofed sender can be identified by email providers. This technology will boost your online safety noticeably and you will know for sure that any message sent from a business ally, a bank, and so on, is an authentic one. When you send out 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 fake may either be labeled as such or may never appear in the recipient’s inbox, depending on how the given provider has decided to treat such email messages.