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  • Nicolas Wegener

Why Every Business Should Use DKIM for Email Security

DKIM (DomainKeys Identified Mail) is a security measure that helps protect the authenticity and integrity of emails. It does this by using digital signatures and encryption to verify that an email was actually sent by the domain it claims to be sent from and that it has not been tampered with during transmission.



Here's how it works:

  1. The sender's mail server generates a digital signature for the email by running a cryptographic hash function on the email's content and adding a private key. The private key is known only to the sender's mail server and is used to create the digital signature.

  2. The digital signature is then added to the email's header as a DKIM-Signature field. This field contains the signature, the public key, and other information that is used to verify the signature.

  3. When the email is received by the recipient's mail server, it retrieves the public key from the DKIM-Signature field and uses it to verify the digital signature. If the signature is valid, it means that the email was actually sent by the domain it claims to be sent from and that it has not been tampered with during transmission.

So why are DKIM keys important for email? There are several reasons:

  1. Spam and phishing: DKIM helps protect against spam and phishing attacks by verifying the authenticity of emails. If an email fails the DKIM check, it is more likely to be spam or a phishing attempt.

  2. Reputation: DKIM helps protect the reputation of a domain by ensuring that only emails sent by the domain are delivered to the recipient's inbox. If a domain's emails are frequently flagged as spam or phishing attempts, it can damage the domain's reputation and result in fewer emails being delivered to the recipient's inbox.

  3. Deliverability: DKIM helps improve email deliverability by allowing recipient mail servers to verify the authenticity of emails. This helps ensure that legitimate emails are delivered to the recipient's inbox, rather than being marked as spam or rejected.

Overall, DKIM keys are an important security measure for email. They help protect against spam and phishing attacks, improve the reputation of a domain, and improve email deliverability. By implementing DKIM, email senders can ensure that their emails are secure and reach their intended recipients.

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