Notes about Email Security.

An excellent tool to verify many of these security features is the Anti.Phishing Domain Verification tool from AnubisNetworks:

Domain Verify is a free tool by Mailspike.

This tool allows you to check well known systems related to a Domain.

Systems include DMARC and TLS Reporting, as well as many more.

The primary goal of this tool is to raise awareness on the terrible Phishing attacks every organization suffers regularly.

Name Servers Configuration | SMTP Servers | DNSSEC | SPF | DMARC | DANE | TLS | TLS-Reporting | MTA-STS