How many cold emails can you send per day? There are two answers, and people mix them up constantly. The first is the provider’s hard limit: Google Workspace allows 2,000 messages per user per day, free Gmail stops at 500, and a Microsoft 365 mailbox can address 10,000 recipients a day. The second is the number that keeps your mail out of the spam folder, and it is much smaller.
Experienced cold senders generally hold a warmed-up mailbox to around 30 to 50 cold emails a day, start a brand-new mailbox in the single digits, and get bigger totals by adding mailboxes and domains, not by pushing one inbox harder. The first number is documented. The second is a convention, not a rule, and this post explains where it comes from and how to use it.
How many cold emails can you send per day before the provider stops you?
These are the official caps for the mailboxes most cold senders use, taken from each provider’s own documentation on 2 September 2026. Limits change, so re-check the linked pages before you plan around them. Rolling 24 hours means any 24-hour window, not a calendar day.
| Provider | Daily cap per mailbox | Other limits worth knowing | New or trial accounts |
|---|---|---|---|
| Google Workspace | 2,000 messages per user per day (rolling 24 hours) | 10,000 total recipients per day, but only 2,000 unique external recipients; after hitting a limit, no sending for up to 24 hours | 500 messages and 500 unique external recipients per day on trial; not raised during the trial |
| Free Gmail | 500 messages per day | 500 recipients per message; after a block, sending returns within 1 to 24 hours | No separate figure published |
| Microsoft 365 (Exchange Online) | 10,000 recipients per day per mailbox (24-hour period) | 30 messages per minute; recipients per message customizable up to 1,000; an organization-wide external-recipient cap tied to license count | Trial organizations capped at 5,000 external recipients per day; a default onmicrosoft.com domain gets 100 external recipients per organization per 24 hours |
| Outlook.com | 5,000 recipients per day for Microsoft 365 subscribers | 500 recipients per message; 1,000 “non-relationship” recipients per day (people you’ve never emailed); lower for non-subscribers | New accounts start on a temporary low quota until they establish credibility |
| Zoho Mail | No daily figure; external sending is 50 to 500 emails per hour, set dynamically from sender reputation, recipient engagement and contact quality | 1,000 internal emails per hour; 100 recipients per message on free accounts, 150 on paid; rolling one-hour window | No separate figure; the external limit is reputation-based for every account |
Sources, all checked 2 September 2026: Google Workspace Admin Help, Gmail sending limits in Google Workspace; Gmail Help, Limits for sending & getting mail; Microsoft Learn, Exchange Online limits; Microsoft Support, Sending limits in Outlook.com; Zoho Mail, Rates, limits, and policies. Yahoo Mail is absent because its help page says Yahoo doesn’t disclose how many messages or recipients you can send at one time.
The headline numbers are the least useful part of that table. The providers already treat strangers differently: Outlook.com allows one-fifth as many non-relationship recipients as total recipients, Google Workspace lets a user address 10,000 recipients a day but only 2,000 unique external ones, and Zoho publishes only a range that moves with reputation. Cold email is, by definition, mail to strangers, so wherever a provider gives two numbers, the tighter one is yours. And new accounts are on a shorter leash: a Workspace trial gets a quarter of the paid limit (Google says the full limit arrives only after the domain has paid at least $100 in total, and up to 75 days after that), Outlook.com says new accounts start low until they’ve earned trust, and Microsoft’s Exchange Online page adds that the service isn’t suited to bulk mailing.
Why the cap is not the safe number
Reaching the cap gets you a temporary block. Sending anywhere near it can get you something worse: a reputation problem that can follow your domain around for months. Your emails keep leaving. They just stop arriving in inboxes.
The caps exist for a company’s ordinary mail: invoices, replies, meeting invites, mostly to people who know the sender. A cold mailbox produces the opposite pattern. Every recipient is a stranger, so replies are rare, a few people press “report spam,” and some addresses turn out to be dead. Gmail, Outlook and the rest build your domain’s reputation out of exactly those signals, and they don’t wait for you to reach 2,000 a day before acting. A brand-new domain sending hundreds of cold emails on day one is doing exactly what spammers do.
So the cap tells you where sending stops. Reputation tells you where delivery stops, and it stops much earlier.
The safe number: what experienced senders actually do
There is no official safe number. No provider publishes one, and anyone quoting an exact figure is passing on a convention. The conventions are consistent enough across cold email tools and agencies to be worth knowing, though.
For a mailbox on a young domain, the usual practice is to warm it up first: two to four weeks of ordinary, low-volume, conversational mail, with the domain’s authentication records (SPF, DKIM and DMARC, the DNS settings that prove mail really comes from you) already passing, so the mailbox has a history before any stranger hears from it. Then start cold email in the single digits per day and add a few more every few days while replies come in and bounces stay near zero. Most guides settle somewhere between 30 and 50 cold emails per mailbox per day. Some push a well-aged mailbox toward 100, but that’s the upper edge of anything I’ve seen recommended.
| Week | Cold emails per mailbox per day | What to watch |
|---|---|---|
| Before week 1 | 0 (warm-up mail only) | Authentication passing; warm-up replies arriving |
| Week 1 | 5 to 10 | Any bounce at all: stop and check the list |
| Week 2 | 10 to 20 | Bounce rate under 2%; a few real replies |
| Week 3 | 20 to 30 | Placement in test inboxes at Gmail and Outlook; any complaint |
| Week 4 and after | 30 to 50, then hold | Reply rate steady; no sudden drop in opens or replies |
Those numbers are a shape to follow; the pace should come from your own bounces and replies. If bounces rise or replies dry up, drop back to the previous week’s volume. Keep the warm-up running after the campaign starts, because a mailbox that only sends and never receives looks like a machine. And use the quiet weeks to get the message right: our cold email marketing guide covers what to write so the few emails you send earn replies.
Scaling up: more mailboxes, not bigger blasts
Once you accept a per-mailbox ceiling of a few dozen a day, the arithmetic is simple: daily volume is mailboxes multiplied by the per-mailbox number. Senders who need thousands of cold emails a week add inboxes across secondary domains and keep each one inside the convention.
| Setup | Per mailbox per day | Total per day | Per week (5 sending days) |
|---|---|---|---|
| 1 mailbox | 40 | 40 | 200 |
| 1 domain, 3 mailboxes | 40 | 120 | 600 |
| 3 domains, 3 mailboxes each | 40 | 360 | 1,800 |
| 5 domains, 3 mailboxes each | 40 | 600 | 3,000 |
That table assumes a couple of things. Never run cold outreach from your main company domain: if a secondary domain picks up a bad reputation you retire it, and the domain your invoices come from stays clean. And keep only two or three mailboxes per domain, because domain reputation is shared, and a dozen mailboxes hammering strangers from one domain looks no more human than one mailbox doing it.
There’s a cost to this, obviously: authentication records for every domain, warm-up weeks for every mailbox, and a sending tool that rotates inboxes and spaces messages through the working day. That cost is the point. Volume in cold email is something you build infrastructure for.
What really sets your limit: bounces and complaints
Providers judge you by what happens to the emails you send, far more than by how many you send, and two outcomes matter most.
Bounces come first, because they’re the outcome you control before sending. A hard bounce tells the receiving provider you emailed an address that doesn’t exist, the signature of an old or scraped list. Our guide to a good email bounce rate puts the danger line at about 2%, and for a cold sender that is tiny in absolute terms: on a mailbox sending 40 a day, one bad address is already a 2.5% bounce rate. Five dead addresses put it at 12.5%.
Complaints are the second, and here Google has published its threshold: its sender guidelines say to keep the spam rate reported in Postmaster Tools (Google’s free reputation dashboard for senders) below 0.10% and never let it reach 0.30%. That’s three complaints per thousand emails, and the way to stay under it is to write only to people with a plausible reason to hear from you.
This is why list quality and safe volume are the same subject. Your safe volume is a budget, maybe 40 attempts a day per mailbox, and every attempt on a dead address is a wasted slot that also counts against you. Running the list through the Reoon Email Verifier before a campaign removes invalid addresses, flags disposable and role-based ones (shared addresses like info@ or sales@), and sets aside catch-all domains (which accept mail for any address, so no mailbox can be confirmed) for a smaller batch later, or never. If the list came from a scrape or an old CRM export, follow the fuller scraped-list cleaning workflow first. The result is that your 40 attempts land on 40 real people, which is the only way a small daily volume turns into a pipeline.
An honest opinion on “500 a day from one inbox”
You’ll see this advice on forums, usually with the free Gmail cap as evidence: the limit is 500, so send 500. I think it’s the most expensive advice in cold email, and here’s how it plays out.
Day one, a few hundred messages leave a mailbox with no sending history. Some go to dead addresses, because the list was never verified. Gmail’s filters see a burst of mail to strangers from a young domain with bounces mixed in, and by the afternoon most of the rest is landing in spam. The sender notices nothing, because the emails were “sent.” By day three the provider is throttling the mailbox, holding back or slowing its outgoing mail, replies are zero, and the domain’s reputation needs weeks of small, clean sending to recover, if it recovers at all. Then the usual next step: buy another domain and do it again. That churn is exactly the pattern the filters were built to catch.
In my experience, forty a day from three warmed mailboxes reaches more real inboxes in a week than 500 a day from one burned mailbox manages in a month. The slow number wins on results as well as safety.
The short version
- Provider caps run from 500 a day (free Gmail) to 10,000 recipients a day (Microsoft 365), and say nothing about safety.
- No official safe number exists. The working convention is 30 to 50 cold emails per warmed mailbox per day, reached over about four weeks from a single-digit start.
- Scale by multiplying mailboxes across secondary domains, two or three per domain, never your main company domain.
- Bounces and complaints decide how much volume your domain tolerates: keep bounces under 2%, complaints far under 0.3%, and verify the list before every campaign so safe volume goes to real people.
- Before any send, run the cold email deliverability checklist: warm-up, authentication and list checks in about 15 minutes.
The list check is the one part you can do today, free. A Reoon Email Verifier account comes with free verification credits every day, no card required, enough to verify one mailbox’s first week of cold email addresses before any of them can cost you a bounce.
FAQ
How many cold emails can I send per day from Gmail?
Free Gmail caps sending at 500 messages a day and Google Workspace at 2,000 per user per rolling 24 hours (500 on trial). Those are technical limits, not safe volumes. For cold email the working convention is far lower: roughly 30 to 50 a day from a warmed-up mailbox, single digits from a new one.
How many cold emails should I send per day from a new domain?
Start with two to three weeks of warm-up mail and no cold email at all. Then begin around 5 to 10 per mailbox per day, adding a few every few days while bounces stay near zero and replies arrive, until you reach 30 to 50 by about week four. These are conventions, not rules, so slow down the moment results wobble.
Is it better to send more from one mailbox or add more mailboxes?
Add mailboxes. Reputation is built per mailbox and per domain, so 120 emails a day from three mailboxes looks like three busy people, while 120 from one mailbox looks like a script. Keep two or three mailboxes per secondary domain, warm each one separately, and never run cold outreach from the domain your business actually uses.
Does verifying my list let me send more cold emails per day?
No, but it makes each one count. Your safe volume is set by reputation, and bounces are the fastest way to lose it: one dead address in 40 sends is already a 2.5% bounce rate. Verification removes invalid, disposable and risky addresses beforehand, so each of your limited daily attempts reaches a real person instead of counting against you.
