Posteo · Domain Security

Posteo Domain Security

Domain security

Domain security posture for Posteo, probed live across 1 host(s) and 1 registrable domain(s). 1 host(s) serve HTTPS (up to TLSv1.3); 1 advertise HSTS. Email/DNS controls: DNSSEC present, SPF present, DMARC present (p=none).

EmailPrivacySecuritySustainabilityGerman

Transport & Host Security

posteo.de
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Feb 24 23:59:59 2027 GMT

Domain (DNS/Email) Security

posteo.de
DNSSEC: yes · SPF: yes · DMARC: yes (p=none) · CAA: yes

Source

Domain Security

posteo-domain-security.yml Raw ↑ 
generated: '2026-10-27'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: posteo.de
  https: true
  tls_version: TLSv1.3
  cert_expires: Feb 24 23:59:59 2027 GMT
  hsts: true
  hsts_max_age: 31536000
domains:
- domain: posteo.de
  dnssec: true
  caa:
  - 0 issue "d-trust.net"
  - 0 issue "geotrust.com"
  - 0 issuewild "d-trust.net"
  - 0 issuewild "geotrust.com"
  - 0 iodef "mailto:hostmaster@posteo.de"
  - 0 issue "certum.pl"
  spf: true
  dmarc: true
  dmarc_policy: none

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