A message sent without DKIM and/or SPF may be considered suspicious by the different email analysis tools. These protocols have become the standard in the email world. Thanks to these protocols, your emails will be better identified by ISPs (Internet Service Providers) and your recipients’ email clients, which improves the chances of your emails reaching your contacts’ inbox and not the spam folder. In fact, the implementation of these protocols improves email deliverability. They’re some of the most effective ways to prevent phishing and email spoofing, like keeping scammers from posing as legitimate email senders and domain owners and impersonating their identities using the same domain name.īut this is not DKIM’s only advantage.
#SETUP SURGEMAIL VERIFICATION#
The main reason you should use DKIM verification is pretty simple: along with SPF and DMARC, these are the main email authentication methods for verifying the identity of senders. Using the public key, anyone can tell whether the email was sent by the owner of the domain or not. If this validation check fails or if the message header – and therefore the digital signature – does not exist, many different email service providers (including major ones like Gmail and Outlook) raise an alarm and may, depending on the volume of email sent, decide to mark this email as spam or even to block the sender IP address. One of the beauties of public key cryptography is that the keys are like siblings: they share DNA. When a receiving SMTP email server detects a signature header, it looks up the public part of the key by asking the domain name system (DNS) for the TXT record. The signature is basically a hash code, and is computed by taking the content of the email and combining it with the private key using a security algorithm. The signature is then saved as a header field of the email. The private key is then used to create a DKIM signature for each email message. Then, you have to enter the public part of the key as a TXT record to the domain that’s used as the sender address.
It relies on asymmetric encryption and therefore works with any tool developed for that purpose.įirst, you have to generate a private/public key pair.
The purpose of DKIM is not only to prove that the domain name has not been falsely used by others, but also that the signed message has not been altered during transmission. Receiving email servers can then check the signature to verify the authenticity of the sending domain. DomainKeys Identified Mail, or DKIM, is an authentication protocol that links a domain name to a message. DKIM uses asymmetric encryption to add a digital signature to the header of your outbound emails, allowing you to sign your email with your domain name.
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