What is DMARC?
DMARC (Domain-based Message Authentication, Reporting, and Conformance) is an email authentication protocol designed to help protect domains from unauthorized use, such as phishing or email spoofing. It works by building on two other authentication protocols: SPF (Sender Policy Framework) and DKIM (DomainKeys Identified ...
This guide explains the common issue of mismatched MX records and PTR (Reverse DNS) settings in shared hosting environments, and provides steps to diagnose and resolve it.
DNS and mail server hosting
Manage DNS and mail records with VPS-level control
MX and PTR records affect email delivery, reputation, ...