Why we built our own domain lake instead of renting one

Every cold email tool on the market sells you access to the same handful of rented contact databases. Same leads, same overused inboxes, same "verified" addresses that bounced for the last three vendors too. The differentiation they sell you is the UI wrapped around identical underlying data.

We took a different bet: own the data supply.

The lake, not the list

outreachstack ingests domains-monitor's full feed — roughly 343 million domains across ~1,570 zones, with ~300k new registrations and ~250k drops every day. That firehose lands in ClickHouse, not a CRM table, because a CRM table is the wrong shape for "which of these domains switched from Google Workspace to Microsoft 365 last week."

MX and TXT records alone tell you which email provider a company runs. Technology fingerprints tell you their stack. Registration date tells you company age. ASN and GEO tell you where they actually are, not where their website's footer says they are. None of that is a "contact list" in the traditional sense — it's a queryable surface, and querying it is what an ICP actually is.

Newly registered domains are the flagship signal

Most cold email lists are stale by definition — someone scraped them months ago and resold them a dozen times since. We treat the daily registration feed as the flagship product, not an afterthought: a domain that registered this week has never been pitched by anyone. That's the highest-signal, lowest-noise segment in cold outbound, and it only exists if you're ingesting the feed daily instead of buying a quarterly export.

What this unlocks downstream

Owning the lake is also what makes the ICP refinement loop possible. When a segment of positive replies shares an attribute the current ICP doesn't filter on — say, 80% of your best replies run Shopify plus a specific email marketing stack — that's not a hunch, it's a query against the same lake your leads came from. Expansion becomes evidence-backed instead of a guess about who to target next.

Renting a list gets you contacts. Owning the lake gets you a system that tells you who to contact next, and why.