Mailhardener

Mailhardener is a DMARC monitoring tool from the Netherlands, developed by Mailhardener B.V. in The Hague. It gathers the reports that mail servers send about a domain and leads its owner through setting up email authentication with SPF, DKIM and DMARC. On top of that it reports on SMTP TLS, serves MTA-STS policies and BIMI assets, and keeps an eye on DNS changes. The dashboard lists every sender of mail for the domain and tracks their authentication results as time goes by. Service providers who look after many customer domains can use a multi-tenant package.