May 05, 2026 · 13 min
The myth of cold email A/B testing
Most cold email A/B test lifts are sample-size theater. The timing variable swamps copy variance. Here's what's actually testable in 2026.
arthur
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May 05, 2026latest
Apr 16, 2026 · 11 min
The cold email playbook that still works in 2026 (and what finally killed the old one)
Cold email didn't die in 2019. It died in February 2024 when Google and Yahoo rewrote sender rules. Here's what survived, the reply-rate math you can plan against, and where the trigger has to come from.
arthur
Feb 12, 2026 · 13 min
The AI reply generator dilemma: fast and cheap vs personalized and slow
AI reply generators face a dilemma: fast and cheap is templated-with-extra-steps, slow and personalized is barely better. The third mode no one is building.
arthur
Jan 15, 2026 · 7 min
How to use HN's Who's Hiring thread for cold outreach that doesn't suck
HN's Who's Hiring thread is a buying-signal goldmine. Full workflow: scrape, parse stack, identify fit, send a 3-line cold email referencing the JD.
arthur
Dec 19, 2025 · 7 min
Enrichment workflows: from a Reddit username to a verified work email in 90 seconds
Reddit username to verified work email in 90 seconds. The exact enrichment pipeline, the realistic hit rate, and the fallback branch when there's no LinkedIn.
arthur
Dec 03, 2025 · 9 min
The contextual cold message: how to reference a specific Reddit post without being creepy
Contextual cold message playbook: how to reference a specific Reddit post in outbound without being creepy, with two annotated samples and a four-part anatomy.
arthur
Nov 25, 2025 · 9 min
The reply rate math: why 20 personalized messages beats 500 templated ones
The reply rate math broken down input by input: 500 templated cold emails versus 20 contextual messages. Per-message ROI is 60x. Here's the calculation.
arthur
Oct 27, 2025 · 12 min
Volume outbound is dead: why intent-based beats blast
Volume outbound is dead: reply ceilings on templated blast collapsed past 0.5%. The math, the inbox-filter cause, and what intent-based replaces it with.
arthur