DKIM, which stands for DomainKeys Identified Mail, is an email validation system, which stops email addresses from being forged and email content from being modified. This is done by attaching a digital signature to every message sent from an email address under a specific domain name. The signature is created based on a private encryption key that’s available on the outbound SMTP server and it can be verified using a public key, which is available in the global DNS database. Thus, any message with altered content or a spoofed sender can be recognized by email providers. This method will heighten your online security substantially and you’ll be sure that any email sent from a business collaborator, a banking institution, and so on, is authentic. When you send out email messages, the recipient will also be sure that you are indeed the one who has sent them. Any email that turns out to be bogus may either be tagged as such or may never show up in the receiver’s inbox, depending on how the given provider has chosen to cope with such emails.