DKIM, which is an acronym for DomainKeys Identified Mail, is an authentication system, which obstructs email addresses from being spoofed and email content from being tampered with. This is achieved by attaching an electronic signature to each and every email message sent from an address under a certain domain. The signature is created on the basis of a private key that’s available on the SMTP mail server and it can be validated using a public key, which is available in the global DNS database. Thus, any email with edited content or a spoofed sender can be recognized by mail service providers. This approach will increase your online safety substantially and you will be sure that any e-mail message sent from a business collaborator, a bank, and so on, is an authentic one. When you send emails, the receiver will also know for sure that you are indeed the one who has sent them. Any email that turns out to be forged may either be tagged as such or may never end up in the recipient’s mailbox, depending on how the given provider has chosen to cope with such emails.