A personal Gmail account can send to about 500 recipients a day. A paid Google Workspace account can send 2,000 messages a day — 1,500 through Gmail’s mail merge — to no more than 10,000 recipients in total and 3,000 outside your domain, while a Workspace free trial is capped at 500. Go over a limit and Gmail blocks new sending for up to 24 hours. These are Google’s abuse ceilings, not targets: for cold email, plan on 30–50 emails per mailbox per day, follow-ups included, and add mailboxes when you need more.
Key takeaways
- Personal Gmail: about 500 recipients a day, and no more than 500 in one email.
- Google Workspace: 2,000 messages a day per user (1,500 with mail merge, 500 on a trial), counted over a rolling 24 hours.
- Hitting a limit stops new sending for up to 24 hours. You can still receive mail.
- Microsoft 365 allows 10,000 recipients a day per mailbox, but a tenant-wide cap on external recipients applies too.
- Safe cold volume is far below every one of these limits, and follow-ups count toward it.
Gmail and Google Workspace limits at a glance
These are the Gmail and Google Workspace sending limits Google publishes in its Google Workspace Admin Help (updated October 9, 2026) and Gmail Help, as of October 2026. Google notes that sending limits can change without notice.
| Limit | Personal Gmail | Google Workspace |
|---|---|---|
| Messages per day | About 500 | 2,000 per user; 1,500 with mail merge; 500 on a free trial |
| Recipients in one message (To, Cc and Bcc) | 500 | 2,000, of which no more than 500 external |
| Recipients per message sent over SMTP by POP or IMAP users | — | 100 |
| Recipients per message sent with the Gmail API | — | 500 |
| Total recipients per day | — | 10,000; 1,500 with mail merge |
| External recipients per day | — | 3,000 |
| Unique recipients per day | — | 3,000, of which 2,000 external (500 external on a trial) |
| Auto-forwarded messages per day | — | 10,000, not counted in the sending limit |
A dash means Google doesn’t publish a separate figure for personal accounts. Limits for Google’s SMTP relay service, Apps Script and Google Groups are different and aren’t covered here.
How Google counts toward the limit
- A rolling 24 hours, not a calendar day. Google applies Workspace limits “over a rolling 24-hour period, not a set time of day”. Mail you send at 9am counts until 9am tomorrow.
- Recipients, not just messages. Each address counts every time you send to it. Google’s example: five messages sent to ten addresses count as 50 total recipients — but as 10 unique recipients.
- Everything you send. Follow-ups, replies to prospects, messages sent from your aliases, by delegates and by the vacation responder all count. A tool sending through the Gmail API uses the same allowance as you do by hand.
- External means outside your primary domain, including your own domain aliases and alternate domains.
- Mail merge is Gmail’s own feature for sending personalized copies of one email to a list. It’s available on several Workspace plans, and Google limits it to 1,500 a day.
Trial and new Workspace accounts
A Workspace free trial can send 500 messages a day to at most 500 unique external recipients, and Google doesn’t raise limits during the trial. When you convert to a paid plan, Google says limits rise automatically once the domain has paid at least US$100 in total — and that the increase can take up to 75 days after that threshold is met.
That matters if you set up a new domain with one or two inexpensive seats for outreach: it can take months of billing to reach US$100. Until the higher limits arrive, plan as though the trial figures still apply. A new domain shouldn’t be sending anywhere near 500 cold emails a day in any case — see email warmup.
What happens when you hit the Gmail limit
Gmail stops you sending and shows one of these messages:
- “You have reached a limit for sending email.”
- “You reached a Gmail sending limit.”
- “You exceeded the maximum recipients.”
For Workspace accounts, Google says users “can’t send new messages for up to 24 hours”, though they can still sign in, receive email and use their other Google services, and the limit resets after the suspension period. For personal Gmail, Google says you should be able to send again “within 1 to 24 hours”. Software sending over SMTP gets the bounce 550 5.4.5 Daily user sending limit exceeded, listed in Google’s SMTP error reference.
Two more things to know:
- Google may suspend an account that exceeds its limits, and accounts that send spam “might be permanently restricted from sending email”.
- Personal Gmail has a separate stop for bounces. If a large number of your messages can’t be delivered because the addresses are invalid, Gmail shows “Messages you sent couldn’t be delivered”, and you may have to wait 24 hours. Verify lists before you send — see email list verification.
Can you use a personal Gmail account for cold email?
Technically you can send a few hundred emails a day from one. In practice it’s the wrong tool, for three reasons:
- Policy. Gmail’s program policies say not to use Gmail “to distribute spam or unsolicited commercial mail”, and Google can restrict accounts that break them.
- Authentication. You can’t publish SPF, DKIM or DMARC records for gmail.com, so your outreach can never be authenticated as your own business. And you can’t send as a @gmail.com address through another provider’s servers: Google’s sender guidelines warn that impersonating Gmail From headers runs into its DMARC quarantine policy.
- Trust. A prospect deciding whether to reply sees a free address instead of a company domain.
A Google Workspace account on a domain you own fixes all three, and once it is past the trial limits its daily allowance is four times higher.
Daily caps aren’t the only limit
The daily cap is about your account. Receiving servers make their own judgment on top of it. When Gmail sees “an unusual rate of unsolicited email” from your domain or IP address, it temporarily rate-limits your mail with error 4.7.28, however much of your daily allowance is left. Google’s sender guidelines say to stop sending for at least 10 minutes when that happens, then resume slowly. A single busy recipient can also refuse mail that arrives too fast (4.2.1).
So the useful question for cold email isn’t “how close to 2,000 can I get?” but “what volume looks normal for this mailbox?” Google’s guidelines are explicit: send at a consistent rate, avoid bursts, and don’t introduce sudden spikes — even doubling your previous volume can trigger rate limiting.
Outlook.com and Microsoft 365 limits compared
Microsoft publishes its limits in Microsoft Support for Outlook.com and on Microsoft Learn for Microsoft 365 (Exchange Online). As of October 2026:
| Personal Gmail | Google Workspace | Outlook.com | Microsoft 365 | |
|---|---|---|---|---|
| Daily limit | About 500 recipients | 2,000 messages (1,500 mail merge; 500 trial) | 5,000 recipients for Microsoft 365 subscribers; lower and unpublished for free accounts | 10,000 recipients per mailbox |
| Recipients in one message | 500 | 2,000 (500 external) | 500 | Up to 1,000, set by your admin |
| Other limits | — | 3,000 external recipients a day | 1,000 “non-relationship” recipients a day — people you’ve never emailed before | 30 messages a minute; a tenant-wide daily cap on external recipients that scales with license count (5,000 on trial tenants) |
| Counting window | Not stated | Rolling 24 hours | Not stated | Rolling 24 hours |
Microsoft notes that a new Outlook.com account starts with a low, temporary quota until it establishes “credibility in the system”, and it’s blunt about bulk mail: Exchange Online customers who need to send legitimate bulk commercial email “should use third-party providers that specialize in these services”. For cold outreach from Microsoft 365, the tenant-wide external recipient limit is the one to watch, because every cold email is external and the cap is shared by everyone in the organization. Mail sent from the default onmicrosoft.com domain is limited to 100 external recipients a day per organization.
How many cold emails a day is safe?
No mailbox provider publishes a safe number for cold email. What decides placement is how recipients react, and that depends on your list, targeting and copy as much as on volume. These are the per-mailbox volumes we suggest as starting points, counting every cold email a mailbox sends:
| Stage | Cold emails per mailbox per day, follow-ups included | Conditions |
|---|---|---|
| First two weeks | Start around 20 and grow about 30% a day | Warmest contacts first; see email warmup |
| Established mailbox | 30–50 | Verified list, relevant targeting, replies coming in |
| Upper end | Up to about 100 | Bounces under 2%, no complaints, placement tests landing in the inbox |
These are judgment calls, not published rules. Beyond about 100 cold emails a day, a single mailbox stops looking like a person and starts looking like a campaign, and any problem with a list lands on one mailbox all at once. More volume is better spread across more mailboxes.
How many mailboxes does your volume need?
Work it out in two steps. First, find your steady-state daily sends: once a sequence has run long enough for every step to be live, each day sends roughly the new prospects you add, multiplied by the number of email steps, minus people who replied, bounced or opted out along the way. Then divide by your per-mailbox volume and round up.
mailboxes = new prospects a day × email steps ÷ emails per mailbox a day (round up)| New prospects a day | Email steps | Sends a day at steady state | Mailboxes at 40 a day | Mailboxes at 50 a day |
|---|---|---|---|---|
| 25 | 4 | Up to 100 | 3 | 2 |
| 50 | 4 | Up to 200 | 5 | 4 |
| 100 | 4 | Up to 400 | 10 | 8 |
| 250 | 4 | Up to 1,000 | 25 | 20 |
These are upper bounds, since replies, bounces and opt-outs remove people from later steps. Spread the mailboxes over several domains — we suggest about three mailboxes per domain — so a problem on one domain doesn’t stop all your outreach, and warm up each new mailbox before giving it a full share. The cold email capacity calculator runs these numbers for your own volume.
How SalesScope handles this
SalesScope gives every connected mailbox one number for what it can still send today — the same on every screen — and shows which limit is setting it:
- Provider ceilings. 500 a day for Gmail; 1,500 for Google Workspace by default, which an admin can raise to Google’s 2,000; 300 for Outlook.com; and 5,000 by default for other providers connected over SMTP. A Microsoft 365 mailbox’s limit starts at 500 a day, and SalesScope warns before it goes past 2,000, because the tenant-wide limit on external recipients is shared by everyone in your organization. A mailbox’s own daily limit can never be set above its ceiling.
- Room for people. Automated sending stops 2% short of the ceiling (at least 10 emails), so a rep can still answer a prospect late in the day. Hand-sent mail stops at the ceiling itself, because Gmail locks a mailbox for up to a day when it’s exceeded.
- Provider holds. When Gmail or Microsoft says the limit was hit, the mailbox is held until the lock lifts rather than retrying into it.
- Warm-up and personal caps. New mailboxes ramp up from 20 a day, and an admin can cap what one person sends across all of their mailboxes.
Gmail, Google Workspace, Outlook.com and Microsoft 365 connect with one click, and other providers connect over SMTP. See deliverability guardrails.