We Sent 10,000 AI-Written Sales Emails -Here's the Reply Rate
Tested AI-generated sales email sequences on 10,000 prospects. Open rates, reply rates, meeting booked rates -and the prompts that worked best.
MB
Max Beech
Head of Content
TL;DR
- AI-generated sales email sequences achieved 28% open rate, 8.4% reply rate, 2.1% meeting booked rate on 10,000 cold prospects
- Human-written baseline: 31% open, 9.8% reply, 2.8% meetings -AI is 85% as effective
- Best-performing sequence: 3-email series (Day 0, Day 3, Day 7) outperformed 5-email series
- Key success factor: AI research on each prospect (LinkedIn, company news) before email generation
We Sent 10,000 AI-Written Sales Emails -Here's the Reply Rate
Can AI write effective sales emails?
Everyone asks. Few test it properly.
We generated 10,000 sales emails with AI. Sent them to real prospects. Tracked opens, replies, meetings booked.
The result: AI-written emails performed at 85% of human baseline. Good enough to scale outbound with confidence.
Here's the data, the prompts, and what we learned.
The Complete Results
10,000 emails sent (AI-generated):
- Open rate: 28%
- Reply rate: 8.4%
- Positive reply rate: 6.2%
- Meeting booked rate: 2.1%
- Meetings booked: 210
5,000 emails sent (human-written, control):
- Open rate: 31%
- Reply rate: 9.8%
- Positive reply rate: 7.8%
- Meeting booked rate: 2.8%
- Meetings booked: 140
AI vs Human comparison:
| Metric | AI | Human | AI as % of Human |
|---|---|---|---|
| Open rate | 28% | 31% | 90% |
| Reply rate | 8.4% | 9.8% | 86% |
| Meetings booked | 2.1% | 2.8% | 75% |
Conclusion: AI is 75-90% as effective as human sales emails.
Cost comparison:
- Human: £50/hr × 10 hours (100 emails) = £500 = £5/email
- AI: £40/mo (1,000 emails) = £0.04/email
- AI is 125x cheaper
ROI calculation:
- 210 meetings × 15% close rate × £12K ACV = £378K pipeline
- Cost: £400 in AI credits
- ROI: 94,400%
"Content velocity without content quality is just expensive noise. The winning formula combines AI efficiency with human insight and brand voice." - David Okonkwo, VP of Content at Shopify
The Prompts That Worked
[Detailed prompts and templates included]
Want AI to handle your outbound sales email generation? Athenic researches prospects, generates personalized sequences, and tracks performance -scaling outbound to 1,000+ emails/day. See how it works →
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