Install libopendmarc2 by entering the following commands in the terminal:
sudo apt update sudo apt install libopendmarc2
Library for DMARC validation and reporting
Domain-based Message Authentication, Reporting and Conformance (DMARC), builds on the successes of technologies such as DomainKeys Identified Mail (DKIM) and the Sender Policy Framework (SPF) to create an infrastructure that enforces policy on domain names that are visible to end users, and creates a feedback framework for identifying and tracking fraudulent use of domain names in email. . This package provides library for implementing mail validation and reporting for the experimental DMARC standard.