Companies using Postmark
33 companies in the VendorStacks index name Postmark as part of their email stack in their public web presence. Every match carries the quoted source row it was extracted from — no inference, no fingerprint guessing.
Sample of companies using Postmark
| Company | Used for |
|---|---|
| linear.app | |
| zingle.me | |
| zingle.com | |
| webexpenses.com | |
| savvycal.com | |
| reserve.com | |
| medallia.com | |
| lu.ma | |
| hopper.com | |
| askcody.com |
Showing 10 of 33. The full list — with evidence, source URLs and refresh timestamps — comes back from one API call.
curl "https://vendorradar-production.up.railway.app /v1/prospect?vendor=Postmark" \ -H "Authorization: Bearer vr_live_…"
Commonly appears alongside
Vendors that most often show up in the same stacks as Postmark.
How this is collected
VendorStacks runs a multi-source extraction pipeline over a company's public web presence: crawling, rendering JavaScript pages and PDFs, and matching a deterministic vendor taxonomy against what the company itself publishes. Nothing is inferred from tracking pixels or guessed from job posts — if we say a company uses Postmark, we can show you the sentence that says so. How it works →
Most recent refresh in this set: 2026-07-27.