Domain based Message Authentication, Reporting and Conformance
DMARC is a set of protocols that are used to authenticate the email senders domain. It provides the information to the ISP’s about the senders domain. It also helps in identifying whether the sender is trying to send spoofing mails in your inbox.
This is able to identify a mail by using two different protocols i.e. SPF (Sender Policy Framework) and DKIM (Domain Keys Identified Mail). Therefore, for a domain to get a “PASS” from it, firstly should get a “PASS” from the SPF and DKIM.
Additionally, it is a record and is stored & updated in TXT record of the DNS .
Following are the three types of policy settings for the emails that DMARC offers:
1. None policy:
In this policy, firstly, no actions are taken against any type of spoofing mails and secondly, only reports are generated and provided to get the updates.
2. Quarantine Policy:
In this policy, the spoofing mails are filtered and sent to the junk folder or spam folder.
3. Reject Policy
In this policy, the spoofing mails are bounce back to the senders domain, if they do not “PASS” the DMARC protocols.