Buttondown · Domain Security

Buttondown Domain Security

Domain security

Domain security posture for Buttondown, probed live across 3 host(s) and 2 registrable domain(s). 3 host(s) serve HTTPS (up to TLSv1.3); 3 advertise HSTS. Email/DNS controls: DNSSEC absent, SPF present, DMARC present (p=quarantine).

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Transport & Host Security

buttondown.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Aug 22 00:20:38 2026 GMT
docs.buttondown.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Sep 21 00:07:46 2026 GMT
api.buttondown.email
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Oct 8 01:53:40 2026 GMT

Domain (DNS/Email) Security

buttondown.com
DNSSEC: no · SPF: yes · DMARC: yes (p=quarantine) · CAA: none
buttondown.email
DNSSEC: no · SPF: yes · DMARC: yes (p=none) · CAA: none

Source

Domain Security

Raw ↑ 
generated: '2026-07-11'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: buttondown.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Aug 22 00:20:38 2026 GMT
  hsts: true
  hsts_max_age: 63072000
- host: docs.buttondown.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep 21 00:07:46 2026 GMT
  hsts: true
  hsts_max_age: 63072000
- host: api.buttondown.email
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct  8 01:53:40 2026 GMT
  hsts: true
  hsts_max_age: 63072000
domains:
- domain: buttondown.com
  dnssec: false
  caa: []
  spf: true
  dmarc: true
  dmarc_policy: quarantine
- domain: buttondown.email
  dnssec: false
  caa: []
  spf: true
  dmarc: true
  dmarc_policy: none