1.8M sends off subdomains, 99.7% inbox health
Richard Illingworth says a client ran 1.8 million cold emails in six weeks off root domains that never sent a single one, and claims 99.7% average inbox health across 5,000 accounts. The rule everyone repeats about subdomains burning together may only apply when the root is sending.
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Landing in the inbox
Illingworth says subdomains held at 1.8M sends when the root stayed silent
Richard Illingworth says a client sent 1.8 million cold emails in six weeks off 5,000 Google accounts, with 10 subdomains on each root domain and nothing ever sent from the root. He reports 99.7% average inbox health, a 0.6% bounce rate and 2,000+ opportunities, and says a separate 30 million send test had subdomains performing the same as separate domains.
subdomains only burn together when the root domain is the one doing the sending.
Campaigns and numbers
Christian: 40,447 emails to advisors, 31 leads, $4M claimed pipeline
Christian says a campaign for a finance client sent 40,447 emails and turned 538 replies into 31 leads he values at $4M in pipeline. The list was 22,939 finance contacts, and he says the team skipped the buyer and emailed their advisor instead, with calling run on the same list. He is gating the full breakdown behind a comment.
That's about $129K of pipeline for every lead that said yes.
Workflows and tooling
Lieben names six APIs that run cold email inside Claude Code
Michel Lieben published the six-API chain he uses to run cold email from Claude Code. AI Ark finds companies, PredictLeads flags which are hiring for the roles you care about, BlitzAPI finds the people and emails, LimaData fills what BlitzAPI missed, FullEnrich adds mobile numbers, and Instantly turns the list into a campaign. No results are attached to the build.
the campaign lands in instantly, ready to send