DKIM, which is an acronym for DomainKeys Identified Mail, is a validation system, which blocks email headers from being forged and email content from being modified. This is achieved by adding an electronic signature to each message sent from an address under a particular domain. The signature is created on the basis of a private encryption key that is available on the outbound SMTP email server and it can be verified with a public key, which is available in the global Domain Name System. Thus, any email message with modified content or a spoofed sender can be recognized by mail service providers. This approach will heighten your online safety significantly and you will know for sure that any e-mail sent from a business collaborator, a bank, and so on, is authentic. When you send emails, the recipient will also be sure that you are indeed the one who has sent them. Any email that appears to be bogus may either be flagged as such or may never reach the recipient’s inbox, depending on how the particular provider has chosen to cope with such messages.