Web, domains and email
DMARC
Abbreviation for Domain-based Message Authentication, Reporting and Conformance
In short and in plain language
DMARC is a record in the domain name system.
It tells the receiving side what to do with emails that fail certain checks.
It can also ask for reports. These show who sends mail in the name of the domain.
This makes it harder to misuse your name as a sender. It can also help your mail arrive.
Definition
DMARC is a record in the Domain Name System that tells recipients how to handle emails that fail SPF and DKIM checks. It can also request reports on who sends mail in the name of the domain. This makes misuse of your own sender name harder and can improve delivery.