Fastmail · Domain Security

Fastmail Domain Security

Domain security

Domain security posture for Fastmail, 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 absent, SPF present, DMARC present (p=none).

EmailPrivacySecurityBusinessCloud

Transport & Host Security

www.fastmail.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Dec 30 07:49:21 2026 GMT

Domain (DNS/Email) Security

fastmail.com
DNSSEC: no · SPF: yes · DMARC: yes (p=none) · CAA: yes

Source

Domain Security

fastmail-domain-security.yml Raw ↑ 
generated: '2026-10-14'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: www.fastmail.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Dec 30 07:49:21 2026 GMT
  hsts: true
  hsts_max_age: 31536000
domains:
- domain: fastmail.com
  dnssec: false
  caa:
  - 0 issue "comodoca.com"
  - 0 issue "digicert.com; cansignhttpexchanges=yes"
  - 0 issue "letsencrypt.org"
  - 0 issue "pki.goog; cansignhttpexchanges=yes"
  - 0 issuewild "comodoca.com"
  - 0 issuewild "digicert.com; cansignhttpexchanges=yes"
  spf: true
  dmarc: true
  dmarc_policy: none

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