Cold Email Daily

Subdomain inboxes doubled replies in Illingworth test

Richard Illingworth published the numbers behind the subdomain build he has been describing all week: 1.26 human replies per 100 emails against 0.62 from the same customer's Google inboxes, on the same 18 campaigns. One customer, but it is the first side by side he has shown.

Landing in the inbox

Illingworth posts the test behind his subdomain build: 2x human replies

Richard Illingworth put numbers against the subdomain setup he listed out yesterday, from one customer's October test. Same 18 campaigns, same days, subdomain inboxes against the customer's regular Google inboxes, and none of the subdomains landed on a blacklist.

Richard Illingworth
@RCIllingworth
X
on the same 18 campaigns and the same days, their subdomain inboxes got 1.26 human replies per 100 emails, against 0.62 from their Google inboxes.
Nov 13, 2026 · View on X

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Campaigns and numbers

Abraham puts send volume behind the medical billing campaign: 1,744 for 7 positives

Nick Abraham published the sends behind three offers he has shown before. The medical billing campaign for care facilities went to 1,744 people for 33 replies, 7 of them positive, pitching 20% more from insurance claims, a free month, and one facility going from $25K to $80K a month in collections.

Nick Abraham
@NickAbraham12
X
We sent to 1,744 people and got 33 replies, and 7 of them were positive.
Nov 13, 2026 · View on X

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Workflows and tooling

Lieben and Nowoslawski both publish list builds databases cannot do

Two list-building workflows landed the same day. Michel Lieben says that across 1M+ cold emails in Instantly, tight lists of 500-1,000 people with a reason to reply got 20-30% replies while 100k blasts got 2-3%, and breaks ICP into 34 questions in four parts.

Eric Nowoslawski
@ENowoslawski
X
For .001 you can ask 100 questions in one request and get really great answers back.
Nov 13, 2026 · View on X

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