internet.nl has a nice & tidy check for IPv6, TLS, HTTPS, DNSSEC, DANE (DNS-based Authentication of Named Entities), DMARC (Domain-based Message Authentication, Reporting & Conformance), DKIM (DomainKeys Identified Mail), SPF (Sender Policy Framework) on web and mail servers.
See the results for pmeerw.net: web and email.
posted at: 23:44 | path: /configuration | permanent link