DKIM, which is an abbreviation for DomainKeys Identified Mail, is an email authentication system, which blocks email headers from being forged and email content from being modified. This is done by adding an e-signature to every message sent from an address under a specific domain name. The signature is generated on the basis of a private key that is available on the outbound SMTP email server and it can be verified using a public key, which is available in the global DNS database. Thus, any email with altered content or a forged sender can be spotted by email providers. This approach will enhance your web security considerably and you’ll know for sure that any e-mail sent from a business associate, a banking institution, etc., is a legitimate one. When you send email messages, the receiver will also be sure that you are indeed the one who has sent them. Any mail that appears to be bogus may either be labeled as such or may never enter the recipient’s mailbox, based on how the particular provider has chosen to deal with such messages.