DKIM, which is an abbreviation for DomainKeys Identified Mail, is an email authentication system, which obstructs email addresses from being forged and email content from being modified. This is achieved by adding an electronic signature to each message sent from an email address under a specific domain name. The signature is created on the basis of a private encryption key that’s available on the outbound mail server and it can be validated by using a public key, which is available in the global Domain Name System. In this way, any email with edited content or a spoofed sender can be spotted by email service providers. This technology will strengthen your online security substantially and you will be sure that any email sent from a business associate, a bank, and so on, is a legitimate one. When you send emails, the receiver will also be sure that you are indeed the one who has sent them. Any email message that appears to be forged may either be tagged as such or may never be delivered to the receiver’s inbox, depending on how the given provider has decided to treat such messages.