Every known account
One row per company domain carrying a Fastmail record, with the evidence type, a confidence grade and the last-seen date.
Platform #67 of 500 · Install base
Companies that use Fastmail
17,034 known accounts carry Fastmail records in the IXM Install Graph, counted from 2.9 million company domains on 2026-09-04. DNS signals matched: FastMail, Fastmail.
List price by install base: $500 up to 5,000 known accounts, $1,000 up to 10,000, quoted above. How the numbers are made.
What you get
The Fastmail install list
Context on each row
The other platforms seen on the same domain, the email platform, and the hosting country, so you can segment before you reach out.
Delivered in 2 business days
CSV by email. Or search it live: platform plans from $499 a month include install-graph search and exports.
| domain | platform | evidence | confidence | last seen |
|---|---|---|---|---|
| northwind-traders.com | Fastmail | MX host | Strong | 2026-09-10 |
| contoso-logistics.co.uk | Fastmail | MX host | Strong | 2026-08-11 |
| fabrikam-health.io | Fastmail | MX host | Strong | 2026-09-12 |
| adventure-works.de | Fastmail | MX host | Strong | 2026-08-13 |
| tailspin-toys.com | Fastmail | MX host | Strong | 2026-09-14 |
Use it for
What sales teams do with the Fastmail list
Displace
Sell against Fastmail? Every account that runs it, ready for outbound.
Partner
Integrate with Fastmail? Size the joint opportunity and target the overlap.
Benchmark
Track Fastmail adoption by segment, month over month, with a method you can audit.
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Known accounts are distinct domains with the platform's records; one company can own several domains. A record proves a relationship, not seat count or spend. Logos by Logo.dev; trademarks belong to their owners.