DKIM, which is an abbreviation for DomainKeys Identified Mail, is a validation system, which stops email headers from being forged and email content from being modified. This is done by attaching a digital signature to each email sent from an email address under a given domain. The signature is generated based on a private key that’s available on the outbound email server and it can be verified using a public key, which is available in the global Domain Name System. Thus, any email message with modified content or a forged sender can be recognized by email service providers. This technology will heighten your online security dramatically and you will know for sure that any e-mail message sent from a business ally, a bank, and so on, is a genuine one. When you send out email messages, the receiver will also know for sure that you are indeed the one who has sent them. Any mail that turns out to be fraudulent may either be tagged as such or may never show up in the receiver’s mailbox, depending on how the particular provider has decided to deal with such messages.