What is DMARC?
Dmarc (Domain-based Message Authentication, Reporting and Conformance) is an authentication standard created over the years to lock in the SMTP standard that handles email. Dmarc is a technical specification aimed at reducing unwanted email pollution such as spam, phishing through :
SPF (sender policy framework) which is a standard for checking the domain name of the sender of an e-mail and DKIM (standard for reliable authentication of the sender's domain name)
The dns information is secret, it must not be disclosed
You have to show the source and the target here.
How it works
Dmarc checks the alignment of the message between the sender and the recipient according to the verification of the spf and dkim standards if the result obtained is different from the other then Dmarc can treat the mail according to 3 possibilities:
- Do not take any action on the message
- Mark the message as spam and distribute it to the recipient's spam folder
- Tell the receiving servers to reject the message