DKIM, which is an acronym for DomainKeys Identified Mail, is an email validation system, which obstructs email addresses from being forged and email content from being manipulated. This is done by attaching an e-signature to each email message sent from an address under a certain domain name. The signature is published based on a private cryptographic key that is available on the outgoing SMTP mail server and it can be validated with a public key, which is available in the global Domain Name System. In this way, any email message with edited content or a forged sender can be spotted by mail service providers. This technology will increase your online security immensely and you’ll know for sure that any email message sent from a business ally, a bank, etc., is genuine. When you send emails, the recipient 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 enter the receiver’s mailbox, depending on how the given provider has decided to cope with such email messages.