Stack census— back to the censusSurvey 012 · 03.10.2026

Transactional email · indie

Postmark

postmarkapp.com · HTTP 200 in 1,538 ms

6 things were found in the response on 03.10.2026. This is the front door only: whatever runs behind a login, and anything a browser would have to execute to reveal, is not here.

What the page is built with

Tailwind CSSui frameworks
  • css — stylesheet matches --tw-(?:rotate|translate|space-x|text-opacity|border-opacit…

Where it is served from

Cloudflarecdn
  • header — server: cloudflare
  • header — cf-cache-status: DYNAMIC

Where their email goes

Google Workspacewebmail · email
  • dns — MX 10 aspmx.l.google.com
  • dns — MX 20 alt1.aspmx.l.google.com

What is watching the visitor

Google Tag Managertag managers
  • html — googletagmanager.com/ns.html?id=GTM-PWV3TKM" width="0" height="0" style="display:none; vi…
  • html — <!-- Google Tag Manager -->

What stands at the door

HSTSsecurity
  • header — strict-transport-security: max-age=2592000

Everything else

HTTP/3miscellaneous
  • header — alt-svc: h3=":443"; ma=86400

Back to the census.