DKIM, which is an acronym for DomainKeys Identified Mail, is an authentication system, which stops email addresses from being forged and email content from being meddled with. This is done by adding an electronic signature to every message sent from an email address under a certain domain name. The signature is issued on the basis of a private cryptographic key that is available on the outgoing SMTP email server and it can be validated with a public key, which is available in the global Domain Name System. Thus, any message with altered content or a spoofed sender can be recognized by email providers. This approach will strengthen your worldwide web security greatly and you will know for sure that any email message sent from a business collaborator, a bank, and so on, is a genuine one. When you send out messages, the receiver will also be sure that you are indeed the one who has sent them. Any email that appears to be fake may either be marked as such or may never be delivered to the receiver’s mailbox, depending on how the particular provider has decided to handle such email messages.