Have you encountered the prompt message saying “No DMARC record”? If yes, we are here to help you fix the prompt.
In a world where spamming and phishing activities are on the rise, it becomes crucial for businesses to authenticate all the outbound emails so that all the communication from you to your customer becomes legitimate. This is where DMARC assists organizations.
DMARC stands for Domain-based Message authentication, reporting and conformance. It is an email authentication and reporting protocol, where you can authenticate the emails sent from your domain and also make a decision if questions arise on legitimacy.
DomainKeys Identified Mail (DKIM)
DKIM is a modern-day email authentication protocol that makes use of public-key cryptography at the end of the sender to sign email using a private key to validate emails in the receiving server. The receiver then can retrieve the public key from the sender’s DNS (Domain name system) to authenticate the emails. DKIM exists as a TXT record in the DNS of the domain owner. It adds an additional layer of security to the standard SMTP (Simple Mail Transfer Protocol) used to send an email which lacks an in-built authentication mechanism.
Sender Policy Framework (SPF)
Just like DKIM, SPF exists as a TXT record in the DNS of the domain owner. It displays the list of all valid sources authorized to send emails on your behalf. The IP address of the emails which are sent from your domain enables in identifying the email service provider and the server which exists as a record in your DNS as an SPF record. The receiving mail server then validates the message against the SPF record to authorize it and accordingly marks an email as SPF pass or fail.
Stopping the “No DMARC Record” Message
Fixing the “No DMARC record” message is just a matter of few clicks. All you have to do is add a DMARC record for your domain. It can be done just by typing the record which exists in a TXT format in your DNS, in the _dmarc.demo.com subdomain.
The correct DMARC TXT record’s syntax looks something like this:
v=DMARC1; p=reject; rua=mailto:[email protected]
After Publishing a DMARC record
Simply adding a DMARC TXT record to your DNS may resolve the missing DMARC prompt, but it is simply not enough to mitigate impersonation attacks and spoofing.
After publishing the DMARC record, it is important to set your DMARC policy. It can be set to:
- p=none, wherein DMARC is set at monitoring only and emails failing SPF and DKIM will still be delivered to your recipient’s inboxes.
- p=quarantine wherein DMARC is set at enforcement level and emails failing SPF and DKIM will be delivered to the spam folder instead of inbox
- p=reject wherein DMARC is set at maximum enforcement level and emails failing SPF and DKIM would either be deleted or not delivered at all.