DKIM, which is short for DomainKeys Identified Mail, is a validation system, which prevents email addresses from being spoofed and email content from being modified. This is achieved by attaching an e-signature to each message sent from an email address under a particular domain name. The signature is published based on a private encryption key that is available on the outbound SMTP mail server and it can be validated with a public key, which is available in the global DNS database. Thus, any email message with edited content or a forged sender can be identified by mail service providers. This approach will heighten your worldwide web safety significantly and you’ll be sure that any e-mail message sent from a business partner, a bank, and so on, is a genuine one. When you send out emails, the receiver will also know for sure that you are indeed the one who has sent them. Any email message that turns out to be bogus may either be flagged as such or may never end up in the receiver’s mailbox, based on how the particular provider has chosen to deal with such emails.
