Courier · Domain Security

Courier Domain Security

Domain security

Domain security posture for Courier, probed live across 3 host(s) and 2 registrable domain(s). 3 host(s) serve HTTPS (up to TLSv1.3); 1 advertise HSTS. Email/DNS controls: DNSSEC absent, SPF present, DMARC present (p=quarantine).

NotificationsEmailSMSPushAPI

Transport & Host Security

www.courier.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Oct 4 22:32:39 2026 GMT
api.courier.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Sep 11 13:36:56 2026 GMT
realtime.courier.io
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Aug 16 18:44:30 2026 GMT

Domain (DNS/Email) Security

courier.com
DNSSEC: no · SPF: yes · DMARC: yes (p=quarantine) · CAA: none
courier.io
DNSSEC: no · SPF: no · DMARC: no · 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: www.courier.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct  4 22:32:39 2026 GMT
  hsts: true
  hsts_max_age: 31536000
- host: api.courier.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep 11 13:36:56 2026 GMT
  hsts: null
- host: realtime.courier.io
  https: true
  tls_version: TLSv1.3
  cert_expires: Aug 16 18:44:30 2026 GMT
  hsts: null
domains:
- domain: courier.com
  dnssec: false
  caa: []
  spf: true
  dmarc: true
  dmarc_policy: quarantine
- domain: courier.io
  dnssec: false
  caa: []
  spf: false
  dmarc: false