Cold Email Daily

Illingworth posts the subdomain rules: 60 inboxes per root

Richard Illingworth says he tested subdomain sending across roughly 30,000 accounts and runs up to 60 inboxes off one root domain. The root never sends a single campaign.

Landing in the inbox

Illingworth posts the subdomain rules he says held across 30,000 accounts

Richard Illingworth published the setup behind running up to 60 inboxes off one root domain, which he says he tested across roughly 30,000 accounts.

Richard Illingworth
@RCIllingworth
X
somebody sends from the root and one burn takes every branch down with it
Oct 28, 2026 · View on X

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Workflows and tooling

Christian says Claude Code builds a campaign from one website URL

Christian published a breakdown of how his team uses Claude Code to go from a single website to a full cold email campaign. The steps he names: market research, TAM segmentation, ICP personas, lead sourcing, the list build, messaging and QA.

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