60 inboxes on one $10 domain, but Illingworth also warns it kills delivery
Richard Illingworth claims he runs 60 sending inboxes on a single root domain across 2,000 setups, with one 5,000-account client hitting 99.7% inbox on 1.8M sends. The same week he flagged 10 inboxes per domain as spam risk, so the line between packed infrastructure and deliverability collapse is narrower than the setup suggests.
Landing in the inbox
Illingworth says one $10 domain can carry 60 sending inboxes
Richard Illingworth published the infrastructure claim behind his setups: 60 inboxes on a single $10 root domain, split across subdomains rather than 60 separate domains. He says he has run the build across 2,000 cold email setups and cites a 5,000-account client that sent 1.8 million emails at 99.7% inbox health. The same week he listed cramming 10 inboxes onto one domain as a reason mail lands in spam.
99% of all cold emailers i’ve ever spoken to overpay for their setup.
Campaigns and numbers
Christian sizes the outbound motion by contract value
Christian tied a week of campaign numbers to one rule: pick the motion by contract value, not by playbook. Under $5,000 ACV he says a booked meeting costs $900 to $1,400 through an SDR, so the maths only works past 10,000 sends a day with zero personalisation. Above $25,000 the phone leads and reply rate stops mattering: 22,939 contacts for a financial services client, 31 interested, $4M in pipeline.
Judge the campaign on pipeline per interested reply.
Abraham's best offers are things the buyer already buys
Nick Abraham, who says he sends 2M cold emails a month for 300+ businesses, broke down the offers that pull: jet charters, yoga sessions, pallets, painting kits and holiday pies. The jet campaign matched each prospect to a nearby FBO and ran one line: "curious if you have any travel coming up. We have a few charter options leaving from [FBO]."
Hey [First Name], what are you currently paying per pallet?
Workflows and tooling
Lieben maps 28 APIs for running campaigns inside Claude Code
Michel Lieben published the connection map for building a campaign in Claude Code without opening Apollo or Instantly by hand. He names the order: TheirStack or PredictLeads for hiring signals, Apollo or Prospeo for the people, FullEnrich as the email waterfall, a Supabase leads table holding signal and verification status, then Instantly with the campaign left inactive for review.
Check a small sample yourself before enriching the whole list.
Also on the timeline
Abraham reports no reply drop from resting domains
Nick Abraham says domains parked in Hypertide's backup pool show virtually no reply rate difference once pulled out and attached to a sender. He keeps domains resting there perpetually.
Sondors claims five meetings from a weekend send
Frank Sondors says he booked five meetings in one weekend day off two positive replies, one email and one LinkedIn.
Frequently asked questions
Can you really run 60 email inboxes on one domain?
Richard Illingworth claims you can split 60 inboxes across subdomains of a single $10 domain, citing results from 2,000 setups including a 5,000-account client that sent 1.8 million emails at 99.7% inbox health. However, this claim is unverified and he has also said that cramming 10 inboxes onto one domain causes mail to land in spam.
How do I pick between cold email and SDR outreach?
Your choice should depend on contract value: below $5,000 average contract value, booked meetings cost $900 to $1,400 through an SDR so cold email only works above 10,000 sends daily with no personalization. Above $25,000 average contract value, reply rates stop mattering and phone leads become the focus.
What offers actually work in cold email?
The best offers are things buyers already purchase but rarely see pitched by email, such as jet charters, yoga sessions, pallets, painting kits and holiday pies. One jet charter campaign simply matched each prospect to a nearby flight base and asked if they had any upcoming travel.
Do parked domains lose their sending ability?
Nick Abraham reports that domains resting in backup pools show virtually no reply rate difference once they are pulled out and attached to a sender, and he keeps domains parked there permanently.