Illingworth gives away an infrastructure spec for 10,000 sends a day
A free blueprint with a sizing formula, a four week warmup schedule and a bounce rate target, and no reply numbers behind it.
Richard Illingworth published an infrastructure spec he says is what you need to send 10,000 or more cold emails a day and have every one land in the primary inbox. He is giving it away free.
The spine of it is an ordering argument rather than a tool list. Illingworth's line is that your target sets the number of inboxes, the number of inboxes sets the number of domains, and warmup only decides when you are allowed to send that much. He says the blueprint works the daily volume formula through examples at 250, 500, 1,000, 2,000 and 10,000 emails per day, so the sizing question gets answered before anyone buys a stack of inboxes.
your target sets the number of inboxes
What is inside
Alongside the formula he lists a domain setup and DNS authentication checklist covering SPF, DKIM, DMARC and MX for every domain, a four week warmup schedule with daily send targets and health score benchmarks, and a list hygiene system he says keeps bounce rates under 1.5% through verification, catch-all handling and a pre-send check. There are also copy compliance rules aimed at content-level spam filters, covering spintax, trigger words and plain text, plus what he calls a reserve infrastructure strategy so you are not waiting on new domains when you want to scale.
His description of the failure mode is the familiar one. Most senders buy a random stack of inboxes, hit send, and watch the reply rate collapse, and only then work out the setup was never big enough. His advice is to run the formula before buying, two minutes now against rebuilding the whole setup in six weeks.
For people sending, this is a checklist with no campaign results attached. There are no reply rates, no inbox placement data and no volume logs behind the 10,000 a day claim, so the formula is a sizing starting point and not evidence that placement holds at that number. Illingworth has argued earlier that live campaigns held with almost no warmup, which sits awkwardly next to a four week warmup schedule, so decide which of his positions matches your own setup before you buy domains against either.