How cold email works and what it actually measures
Most people think cold email means 'send a lot and see what happens'. The result: a burned domain after 2 weeks (deliverability = 0), a 0.1% reply rate, and then the conclusion 'cold email doesn't work'. Before you write your first email, you have to understand how this channel works and what it measures.
Cold email works on 3 pillars:
- DELIVERABILITY — whether the email reaches the inbox at all (SPF/DKIM/DMARC, domain reputation, not burned),
- OPEN RATE — whether people open it (subject, sender, timing),
- REPLY RATE — whether they reply (list, personalization, copy). That's the hierarchy: if deliverability = 0, the rest doesn't matter. Metrics: you don't measure opens perfectly (the pixel only works when images load), but reply rate is hard: replies / unique sent. The cold email rule: you send less, but precisely — a list of 50 good leads gives more replies than 500 random ones. AI helps at every stage, but it doesn't fix a bad list.
A comparison: Kate sends 500 emails to a bought list — deliverability drops after a week, reply rate 0.2% (1 reply). Tom sends 40 emails a day to a list of 200 researched companies (ICP + buying signal), L3-L5 personalization — reply rate 6% (12 replies out of 200). The difference isn't copy, it's the list and deliverability. You measure: how many unique you sent, how many arrived (bounces), how many replies.
You are a cold email advisor. Context: I want to start cold email. I sell [PRODUCT] for [SEGMENT]. I have [X] hours a week. Task: Explain to me how cold email works: 1. 3 pillars: deliverability, open rate, reply rate — briefly, with a weight for each 2. Which metrics to measure (unique sent, bounces, replies, meetings) and how to track them 3. Why 'send more' doesn't work — what it does to the domain and reply rate 4. When cold email is the right tool and when it isn't (high-value sales? many decision makers?) 5. Where AI fits in (what it does NOT do: it doesn't fix a bad list) Format: 5 sections.
Variations & alternative scenarios
Beginner version: only deliverability + reply rate, no opens.
Advanced version: metrics per campaign and per domain.
Practical exercise
Answer 3 questions: 1) What do I want to achieve with cold email (meetings? deals?) 2) How many hours a week will I give this channel 3) What is my product and who is it for (1 sentence). Write down the answers — that's the foundation of your campaign.