HTTP Headers Analysis for https://mailersend.com

Detected Technologies from Headers

See all in URL Inspect 1

Cloudflare CDN

HTTP Security Headers

Status

Strict-Transport-Security

Present

max-age=63072000, max-age=63072000

Content-Security-Policy

Weak

frame-ancestors Analyze

Content-Security-Policy-Report-Only

Missing

Not configured Analyze

X-Frame-Options

Good

SAMEORIGIN

X-Content-Type-Options

Good

nosniff

Referrer-Policy

Missing

Not configured

Permissions-Policy

Missing

Not configured

Recommendations

• Increase HSTS max-age to at least 1 year and add includeSubDomains
• Significantly strengthen CSP directives
• Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)
• Consider adding Permissions-Policy to control browser features

Performance Headers

Connection

Performance

close

Transfer-Encoding

Performance

chunked

Vary

Performance

Accept-Encoding

connection: close
transfer-encoding: chunked
vary: Accept-Encoding

Caching Headers

Cache-Control

Caching

public, max-age=432000

Etag

Caching

W/"69ef33d6-3be29"

Expires

Caching

Sun, 03 May 2026 09:24:03 GMT

Last-Modified

Caching

Mon, 27 Apr 2026 10:00:54 GMT

cache-control: public, max-age=432000
etag: W/"69ef33d6-3be29"
expires: Sun, 03 May 2026 09:24:03 GMT
last-modified: Mon, 27 Apr 2026 10:00:54 GMT

Content Headers

Content-Type

Content

text/html; charset=utf-8

content-type: text/html; charset=utf-8

Server Headers

Server

cloudflare

server: cloudflare

CORS Headers

No CORS headers found

Cookies Headers

No cookies headers found

Other Headers

Alt-Svc

Other

h3=":443"; ma=86400

Cf-Cache-Status

Other

REVALIDATED

Cf-Ray

Other

9f350300ced4e3c6-IAD

Date

Other

Tue, 28 Apr 2026 09:24:03 GMT

Via

Other

1.1 google

alt-svc: h3=":443"; ma=86400
cf-cache-status: REVALIDATED
cf-ray: 9f350300ced4e3c6-IAD
date: Tue, 28 Apr 2026 09:24:03 GMT
via: 1.1 google

Recommendations

Enable compression (gzip/brotli) to improve performance