DKIM, which stands for DomainKeys Identified Mail, is a validation system, which stops email addresses from being forged and email content from being meddled with. This is done by adding an e-signature to each email message sent from an address under a certain domain. The signature is generated based on a private encryption key that is available on the outbound SMTP 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 spoofed sender can be recognized by email service providers. This method will increase your worldwide web security greatly and you’ll know for sure that any email sent from a business partner, a bank, etc., is a genuine one. When you send messages, the recipient will also know for sure that you are indeed the one who has sent them. Any email that turns out to be forged may either be marked as such or may never be delivered to the recipient’s mailbox, based on how the particular provider has chosen to treat such messages.