Deliverability
How Many Cold Emails Per Day Per Domain?
The short answer: about 50 per domain per day, split across 2–3 inboxes at 15–20 each. Here is how to get to that number safely and how many domains your volume target actually needs.
KP
By Karolis Pečiūra · Founder, AREM Sales
Published July 8, 2026 · 7 min read
The safe limits in 2026
Google and Microsoft no longer judge sending volume alone — they judge engagement per sending identity. A domain that sends 40 emails a day and gets replies stays in the inbox. A domain that sends 200 a day with a 0.5% reply rate lands in spam within a week, regardless of how well it was warmed.
| Level | Safe daily volume | Notes |
|---|---|---|
| Per inbox | 15–20 cold emails | Plus continuous warmup traffic |
| Per domain | 40–50 cold emails | 2–3 inboxes maximum per domain |
| Per inbox, week 1–2 | 5–10 | Ramp up gradually during warmup |
| Absolute ceiling per inbox | 30 | Only with a >5% reply rate and clean lists |
How to size your infrastructure
- Decide your monthly contacted accounts — for example 1,000 accounts × 3 emails = 3,000 sends/month
- Divide by 21 working days → ~145 sends per day
- Divide by 17 (average sends per inbox) → ~9 inboxes
- Divide inboxes by 2–3 → 3–5 sending domains
- Add 20% headroom so you are never running inboxes at their ceiling
The warmup schedule that works
- Days 1–3: buy lookalike domains, set SPF, DKIM and DMARC, create inboxes with real names and photos
- Days 4–17: automated warmup only, 5 → 20 emails per inbox per day, ramping every 2–3 days
- Day 18+: start real sending at 10 per inbox per day and add 3 every other day
- Keep warmup traffic running permanently — never switch it off once cold sending starts
Signals to monitor weekly
- Bounce rate — keep under 2%; above 4%, stop and re-verify the list
- Reply rate — under 1% means the message, not the volume, is the problem
- Spam complaints in Google Postmaster Tools — keep under 0.1%
- Inbox placement seed tests before any volume increase
- Domain age — never send cold traffic from a domain under 14 days old
The mistakes that burn domains fastest
- Sending from your primary company domain
- Six or more inboxes on a single domain
- Jumping from 20 to 100 emails a day in one step after a good week
- Unverified lists purchased in bulk
- Image-heavy HTML emails and tracking pixels on every send
FAQ
- How many cold emails can I send per day per domain?
- Keep a domain under about 50 cold emails per day in total. With 2–3 inboxes per domain sending 15–20 each, that is the safe ceiling for sustained sending in 2026.
- How many cold emails per inbox per day?
- 15–20 per inbox per day for cold traffic, plus warmup traffic on top. Anything above 30 per inbox meaningfully raises the odds of spam placement, even on a warmed domain.
- How many domains do I need for 1,000 emails a day?
- Roughly 20 domains with 2–3 inboxes each, or about 50–60 inboxes at 15–20 sends per inbox per day. Budget €10–€15 per inbox per month plus domain registration.
- How long should I warm up a new domain?
- Two to three weeks minimum. Start at 5 emails per inbox per day and add 3–5 per day until you reach 15–20, while automated warmup traffic runs continuously in the background.
Related reading
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