MailerSend · Domain Security

Mailersend Domain Security

Domain security

Domain security posture for MailerSend, probed live across 3 host(s) and 1 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=reject).

EmailTransactional EmailSMTPMarketingCommunications

Transport & Host Security

www.mailersend.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Sep 15 10:10:15 2026 GMT
developers.mailersend.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Aug 30 12:15:14 2026 GMT
api.mailersend.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Sep 15 10:10:15 2026 GMT

Domain (DNS/Email) Security

mailersend.com
DNSSEC: no · SPF: yes · DMARC: yes (p=reject) · 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.mailersend.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep 15 10:10:15 2026 GMT
  hsts: true
  hsts_max_age: 63072000
- host: developers.mailersend.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Aug 30 12:15:14 2026 GMT
  hsts: false
- host: api.mailersend.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep 15 10:10:15 2026 GMT
  hsts: false
domains:
- domain: mailersend.com
  dnssec: false
  caa: []
  spf: true
  dmarc: true
  dmarc_policy: reject