DKIM, which stands for DomainKeys Identified Mail, is an email validation system, which prevents 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 generated based on a private cryptographic key that is available on the outbound SMTP email server and it can be validated with a public key, which is available in the global DNS database. Thus, any email message with altered content or a forged sender can be spotted by email providers. This approach will heighten your worldwide web security tremendously and you’ll know for sure that any message sent from a business ally, a bank, etc., is authentic. When you send out messages, the receiver will also be sure that you are indeed the one who has sent them. Any email message that appears to be fake may either be flagged as such or may never reach the recipient’s inbox, based on how the given provider has chosen to deal with such email messages.