How Many Cold Emails Per Day, Per Domain?
The short answer, the real numbers from my own inboxes, and why the warmup matters more than the exact count.
It's one of the first questions when you set up cold outreach — and getting it wrong burns the domain you just paid for. So here's the short answer, then the real numbers from my own inboxes.
Send 20–30 cold emails per day, per inbox, after a two-week warmup. With 1–2 inboxes per domain, that's roughly 20–60 emails per day, per domain. And never send from your main domain — use a secondary one.
| Per inbox | 20–30 emails/day |
| Inboxes per domain | 1–2 |
| Per domain | ~20–60 emails/day |
| Warmup before sending | 2 weeks (and leave it on) |
| Which domain | A secondary domain — never your main one |
Why it's "per domain," not just "per inbox"
Mailbox providers like Google and Microsoft judge sender reputation largely at the domain level. Every inbox on yourcompany.com shares that one domain's reputation. So the real ceiling is per domain, not per inbox.
That's why stacking ten inboxes on a single domain and blasting from all of them doesn't work — you're still leaning on one reputation. The safe way to send more is to add more domains, each with a couple of warmed inboxes.
My actual setup
Six Google Workspace inboxes across three secondary domains — two inboxes per domain — each capped in the 20–30/day range. Business hours only, Monday to Friday, plain text, no open or click tracking.
Notice the daily caps: the older inboxes sit at 20/day, and the newer ones are ramping up gradually (11/day) rather than jumping straight to full volume. New inboxes should climb slowly.
Warm up first — and keep it running
Before a single cold email, I warmed every inbox for two weeks. Warmup is automated back-and-forth between real inboxes that builds a positive sending history, so providers trust you before you ever send a cold email. And I leave it on even while campaigns run — it keeps the reputation topped up.
If "landed in spam" ever climbs, that's your signal to slow down or pause cold sending from that inbox until it recovers.
The mistake that cost me
Set the daily cap on the account, not the campaign. I once had two campaigns running at the same time and 88 emails went out from one inbox in a single day — way over my limit. The account-level cap is the one that keeps all your campaigns in line at once. Set it there, and no combination of active campaigns can overshoot.
How to scale without burning your domains
Don't crank a single inbox to 100/day. Add inboxes and domains instead, and keep every inbox in the safe 20–30 range:
- 3 inboxes ≈ 60–90 emails/day
- 6 inboxes ≈ 120–180 emails/day (~2,400–3,600/month)
- Need more? Add domains, not volume per inbox.
Volume is only half of deliverability
Sending slowly and warming up protects your domain from looking like a spammer. But none of it matters if you're emailing addresses that don't exist. A bounce is a bounce — and enough of them wreck your reputation no matter how slowly you send.
In a real campaign I kept the bounce rate under half a percent, and it came from two things working together: disciplined volume and a list where every address was verified first. (I broke down that whole campaign here: how I booked 5 meetings from cold email.)
Slow sending won't save a dirty list
Verify every address — catch-alls included — before it goes into a campaign, so your warmed domains stay healthy. Free plan included, no credit card.
Try it for free