DKIM, which is short for DomainKeys Identified Mail, is an email validation system, which stops email headers from being forged and email content from being manipulated. This is done by attaching an electronic signature to every message sent from an email address under a certain domain name. The signature is created on the basis of a private encryption key that’s available on the SMTP email server and it can be verified using a public key, which is available in the global Domain Name System. Thus, any email with changed content or a spoofed sender can be identified by email service providers. This approach will increase your online security immensely and you will know for sure that any email sent from a business ally, a bank, and so on, is genuine. When you send email messages, 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 marked as such or may never end up in the recipient’s inbox, depending on how the particular provider has decided to handle such email messages.