Every verified account
One row per company with a verified Postmark signal: evidence, confidence grade, last-seen date.
Platform directory · #25 by verified companies
Companies that use Postmark
44,592 verified companies run Postmark, as of 2026-10-02. Signals: Postmark.
A floor, not a market total: IXM counts only companies whose signals it has verified, and the graph grows every day.
Priced by install base, from $500 up to 5,000 companies to $10,000 for the largest platforms. Card checkout, no quote. How the numbers are made.
What you get
The Postmark install list
Context on each row
The other platforms on the same domain, the email platform and the hosting country. Segment before you reach out.
Delivered in 2 business days
CSV by email. Or search it live on a platform plan from $499 a month.
| domain | platform | evidence | confidence | last seen |
|---|---|---|---|---|
| northwind-traders.com | Postmark | vendor verification | Verified | 2026-09-10 |
| contoso-logistics.co.uk | Postmark | vendor verification | Verified | 2026-08-11 |
| fabrikam-health.io | Postmark | vendor verification | Verified | 2026-09-12 |
| adventure-works.de | Postmark | vendor verification | Verified | 2026-08-13 |
| tailspin-toys.com | Postmark | vendor verification | Verified | 2026-09-14 |
Use it for
What sales teams do with the Postmark list
Displace
Sell against Postmark? Every account that runs it, ready for outbound.
Partner
Integrate with Postmark? Size the joint opportunity and target the overlap.
Benchmark
Track Postmark adoption by segment, month over month, with a method you can audit.
Nearby in the directory
Platforms with a similar install base
KnowBe469k accounts
OpenAI62k accounts
Zendesk55k accounts
Adobe43k accounts
Zoom41k accounts
DocuSign39k accounts
Verified companies are distinct domains carrying the platform's signals: a floor that grows every day, not a market total. One company can own several domains. A signal proves a relationship, not seat count or spend. Trademarks belong to their owners.