How to Protect My Domain From Spoofing?(SPF, DKIM, DMARC)

4.3
How to Protect My Domain From Spoofing?(SPF, DKIM, DMARC)

SPF

The Sender Policy Framework record essentially informs the rest of the world which hosts or IP addresses are permitted to send an email for your domain. When email servers receive a message from your domain, they can check your SPF record to determine if the sending server is listed.

This will not only make your email appear more authentic, reducing the likelihood of it being sent to spam folders, but it will also help defend your domain from attackers sending emails with forged headers.

DKIM

The Domain Keys Identified Mail protocol is an email authentication system that uses cryptography to ensure that emails are delivered by reliable servers and have not been tampered with. When a server sends an email with your domain, it uses a secret key (that only trusted servers have access to) to create an encrypted hash of the email contents and adds it to the email headers as a DKIM signature.

The receiving server verifies the email’s autenticity by looking for the necessary public key in your domain's DNS records, decrypting the encrypted hash, and generating a new hash based on the received email contents. The new hash is then compared to the decrypted hash. The email passes DKIM if there is a match, suggesting that it has not been tampered with. If DKIM fails, the email will be treated with caution.

We use CNAME records to manage automated DKIM key rotation, which is a well-known security practice. Three CNAME entries must be created and maintained. This ensures that an active key is always accessible to provide uninterrupted service, while the remaining keys are retired and regenerated on a regular basis to improve security.

DMARC

Domain-Based Message Authentication, Reporting, and Conformance is an email authentication standard or protocol that determines whether an email is authentic or not. It relies on SPF and DKIM to determine the authentication status of emails. It provides visibility of the sources sending emails from your domain, ensures better deliverability, and guarantees domain security so you don’t fall prey to spoofing, phishing, and impersonation attacks.

Why do we need to use DKIM, SPF, and DMARC together?

DMARC integrates SPF and DKIM. SPF allows domain owners to choose an address where they can send emails on their behalf. DKIM uses an encrypted signature to verify that the sender of the email is who they say they are. These two methods create a unique authentication ID that can be used to authenticate and validate emails in a variety of ways. Incoming servers can use these technologies to see the sender of an email, but they cannot determine if the traffic is set up properly. As a result, we cannot act on such information.

DMARC, on the other hand, uses SPF and DKIM results to determine if the email came from a legitimate sender or a fake scammer. You can actively prevent cyberattacks by applying DMARC policies. That is correct! Domain owners can use DMARC to tell the receiving server how to handle email and have full control over the operation of the domain.

Follow these simple steps to effectively implement the DKIM, SPF, and DMARC protocols :

Use email tracking for all applications. Authentication gaps are regulated and tracked by email monitoring. Make sure that DMARC, DKIM, and SPF are enabled for all email applications.

An email authentication error is caused by incorrect syntax. Be sure to use the correct syntax when implementing these protocols in your domain. Implement all three protocols to work synergistically.

DMARC, SPF, and DKIM work best when used together. We recommend that you use all these protocols for your domain to avoid phishing, spoofing, and spam.

Original source: https://emailauth.blog.fc2.com/blog-entry-6.htmlC