How many cold emails can you send per day?
About 30 per address per day — and the limit is the address, not your list. Why volume scales by mailbox, and what actually gets you blocked.
The short answer is about 30 a day per email address, and the important part of that sentence is per address. The ceiling isn’t a property of your list, your sending tool, or your plan. It’s a property of the mailbox you send from.
Why 30
Mailbox providers don’t score “your campaign”. They score the reputation of the sending address and its domain, built from how recipients react — opens, replies, deletions, spam complaints, and above all whether the address you wrote to actually exists.
A brand-new address has no history, and providers treat no history as a reason for suspicion rather than a clean slate. Thirty a day is roughly what a warmed business mailbox sustains without looking like bulk, and it’s low enough that a bad day doesn’t bury you.
There’s nothing magic about the number — sending 45 won’t trip a wire. But the further above it you go, the more your pattern resembles software rather than a person, and pattern is most of what’s being measured.
Volume scales by mailbox, not by effort
If 30/day is the per-address ceiling, more volume means more addresses, each with its own warm-up and its own reputation:
| Addresses | Per day | Per month (weekdays) |
|---|---|---|
| 1 | 30 | ~630 |
| 2 | 60 | ~1,260 |
| 3 | 90 | ~1,900 |
This is why serious outreach runs several sending addresses in parallel rather than pushing one mailbox hard. It’s also why “unlimited sending” is a meaningless claim — the constraint lives at the mailbox, so nobody can sell you past it.
The mistake that costs more than volume
Sending 200 a day from one address is a slow problem. Sending 30 a day to addresses that don’t exist is a fast one.
We measured this across roughly 2,900 sends from our own platform. Bounce rate to
Gmail addresses was 1.1%. To scraped business domains — the info@ and
contact@ addresses listed on company websites — it was 15.1%. Same sending
domains, same days, same volume. The only difference was whether the mailbox on
the other end still existed.
Hard bounces are the fastest way to damage a sending reputation, because they’re the clearest possible signal that you didn’t know who you were writing to. A verified list at 30/day will outperform an unverified list at 100/day, and it’ll still be working in six months.
Ramping a new address
Don’t start a new address at its ceiling:
- Week 1 — 5–10 a day
- Week 2 — 10–20 a day
- Week 3 — 20–30 a day
- Week 4 on — steady at 30
Keep the ramp even. A mailbox that sends 5 one day and 40 the next looks more automated than one that climbs steadily, and consistency is part of the score.
Knowing the numbers is the easy half
None of the above is secret — it’s the operating cost that bites. Running three warmed addresses in parallel means three separate ramps on three separate clocks, per-address daily counting that holds even when a run fails midway, authentication kept valid on every sending domain, and a verified list feeding all of it. Any one of those slipping shows up weeks later as a deliverability decline nobody can trace to a cause.
That’s the real reason most businesses either send far too little to matter, or push one mailbox until it stops working.
What to take away
- The limit is per address, around 30/day once warmed
- More volume means more addresses, not a harder push on one
- List quality beats volume by a wide margin
- Warm new addresses over about a month before running them at full rate