Web, domains and email
DMARC
Abbreviation for Domain-based Message Authentication, Reporting and Conformance
In short and in plain language
DMARC is a record for a domain in the address book of the internet.
It says how to deal with emails that fail other checks. It can also ask for reports.
The reports show who sends email in the name of the domain. This can help a business spot and limit misuse of its address.
Definition
DMARC is a record in the Domain Name System that defines how receivers should handle emails failing the SPF and DKIM checks. It can also request reports on who sends email in the domain's name. This can help a business detect and limit misuse of its sender address.