A DMARC record is a TXT record that specifies how an email server needs to respond to an email that cannot be authenticated. For example, you can decide whether email receivers should reject, quarantine, or ignore a suspicious email using DMARC records. Making a DMARC record is crucial because it enables servers to distinguish between authentic and fake emails. Ultimately, it reduces online dangers like CEO fraud, email spoofing, and phishing.
DMARC works with DKIM and SPF to authenticate messages and decide what needs to be done for them. DMARC records inform the receiver of the steps needed to follow if there is a suspicious email.
Step 1: The domain owner publishes a DMARC DNS Record.
Step 2: The recipient mail server checks for the DMARC record.
Step 3: The mail server verifies the sender using DKIM and SPF authentication and alignment tests.
Step 4: Based on the DKIM & SPF results, the mail server applies the sending domain's DMARC policy.
Step 5: Finally, the receiving mail server sends DMARC Aggregate Reports to the email addresses specified in the DMARC record based on the outcome.
A DMARC record consists of a hostname and key-value pairs. An example DMARC record would look like the below:
In the above example, there are 2 key-value pairs:
Apart from the above, there are 8 more tags that can be used in a DMARC record:
DMARC report is an XML file generated at the end of the DMARC verification process. It contains several elements:
DMARC Record Checker is a diagnostic tool that enables you to check the DMARC record of any particular domain and determine whether the TXT record is accurate and properly published.
When a domain is submitted, the DMARC record checker looks up the DMARC record from the DNS record. It issues an error message if a record is unavailable or invalid. If the record is available, it will show the DMARC policy.
You can achieve multiple benefits from using DMARC records:
You can easily run a DMARC check using an online tool like MX Toolbox. You just need to enter the domain name. It will display the DMARC record if the record is available or an error message if there is no DMARC record.
It is an email that is sent in compliance with the specifications of the Domain-based Message Authentication, Reporting, and Conformance protocol.
DMARC prevents attackers from using your original domain name. But, they can use domains similar to your domain name.
DMARC records allow you to identify the spammers who send emails on behalf of your domain and help to identify the SPF and DKIm authenticated messages from your domain.
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