Google Workspace and Gmail Sending Limits

A Google Workspace user can send up to 2,000 messages a day (500 on a trial account), to at most 10,000 total recipients and 3,000 external recipients a day. A free Gmail account gets about 500 emails a day. Hit a limit and sending stops for up to 24 hours. These are the ceilings Google enforces, not a safe volume for cold email: we recommend up to 25 cold emails per mailbox a day.

We make Outreach2day, cold email infrastructure on standard SMTP/IMAP mailboxes. We don't sell Google Workspace. The numbers below are from Google's own help pages, checked September 2026.

Google Workspace Sending Limits per User

Google applies these per user account, over a rolling 24-hour period, "not a set time of day" (Gmail sending limits in Google Workspace). Messages sent from an alias, by a delegate and by the vacation responder all count toward the user's limit.

How Google counts recipients:

• Total recipients count every address on every message: "5 messages sent to 10 addresses count as 50 total recipients."

• Unique recipients count each address once a day: 5 messages to the same address count as 1.

• External recipients are, in Google's words, "Email addresses outside your primary domain, including domain aliases and alternate domains."

Google also says limits "can change without notice," so treat the table as the current published values.

Trial Accounts

Trial accounts have lower limits, and Google says they "aren't increased during the free trial period." After you convert to paid, limits rise automatically once your domain has "cumulatively paid at least $100 USD," and "It can take up to 75 days after meeting this payment threshold for account sending limits to increase." A new Workspace account bought for outreach can therefore sit at trial-level limits for weeks.

Gmail Sending Limits for Free Accounts

A personal @gmail.com account has a simpler rule. Google's Gmail Help page on sending limits says you may see "You have reached a limit for sending mail" if you send to "more than 500 recipients in a single email" or send "more than 500 emails" in a day. You should be able to send again "within 1 to 24 hours."

The same page lists a second block that matters for cold senders: if many of your emails bounce because addresses are invalid, you may see "Messages you sent couldn't be delivered" and may be able to send again only after 24 hours. For the server settings of personal Gmail, see Gmail SMTP server address, ports and settings. Microsoft's numbers are in Microsoft 365 and Outlook sending limits.

Gmail Sending Limits per Hour

Google does not publish an hourly or per-minute sending limit for Gmail users. User limits are daily, counted over a rolling 24 hours.

What you do see at high speed is a rate limit on the receiving side. Gmail defers mail with 421 4.7.28 when it sees "an unusual rate of email" from your IP address, IP block, DKIM or SPF domain, or a URL domain in your messages (Gmail SMTP errors and codes). That is a spam control, not an account quota, and it does not wait for you to reach 2,000 a day. See the 421 4.7.28 error for what each variant means and how to recover.

Google Workspace SMTP Relay Limits

The SMTP relay service (smtp-relay.gmail.com) routes mail from your own servers or apps through Google. It has separate limits, counted independently from the Gmail user limits (Route outgoing SMTP relay messages through Google):

Two details that change the math:

• Per-user relay limits count unique recipients; per-account limits count total recipients. Google's example: "1,000 messages to Recipient-A and 1,000 messages to Recipient-B" count as 2 toward the user limit and 2,000 toward the account limit.

• If the envelope sender is not a registered user in your Workspace account, "the per-user limits don't apply."

Google may also "reduce the recipient address limit" for your account "depending on your email sending practices," and it emails your super administrators when it detects a user relaying "a significant amount of spam." Relay does not get around the cold email problem: the same filters judge the mail on arrival.

What Happens When You Hit the Limit

In Gmail, the user sees one of these messages:

• "You have reached a limit for sending email."

• "You reached a Gmail sending limit."

• "You exceeded the maximum recipients."

Google says that after reaching one of these limits, "users can't send new messages for up to 24 hours," but can still sign in, receive email and use other Google services. After the suspension period, limits reset.

A sending tool connected over SMTP gets a bounce code instead:

All texts are from Google's SMTP error reference.

Google also warns on the limits page: "User accounts that send spam might be permanently restricted from sending email." A 24-hour lockout is the mild outcome. An account flagged for spam can lose sending for good.

Platform Limit Is Not a Safe Cold Email Volume

The 2,000-a-day figure tells you when Google stops the account. It says nothing about where the emails land. For cold email, the constraint is inbox placement and domain reputation, and they break far below the platform ceiling.

Our recommendation, for any mailbox type:

• Up to 25 cold emails per mailbox a day, not counting warm-up. That is 2,000 ÷ 25 = 80 times below Google's daily message limit. Details: cold emails per mailbox per day.

• Up to 5 mailboxes per domain, so one domain sends at most 5 × 25 = 125 cold emails a day. See mailboxes per domain.

• At least 14 days of warm-up before the first cold email, low cold volume from day 14 and full volume from around day 21.

• Spread sends across the day. Google's sender guidelines say to send "at a consistent rate" and avoid bursts.

To reach a daily volume, add mailboxes instead of raising the per-mailbox number: 1,000 cold emails a day is 1,000 ÷ 25 = 40 mailboxes on 40 ÷ 5 = 8 domains. The cold email capacity calculator does this math for any target.

Google's Rules for 5,000+ Emails a Day

Separate from account limits, Google has sender requirements for mail to personal Gmail accounts (Email sender guidelines). Starting in 2024, every sender must set up SPF or DKIM, keep valid forward and reverse DNS, use TLS and keep the spam rate reported in Postmaster Tools below 0.3%. Senders of more than 5,000 messages a day to Gmail accounts must also pass SPF and DKIM, publish DMARC (the FAQ lists a minimum policy of none), align the From: domain, and support one-click unsubscribe on marketing messages.

Google's sender guidelines FAQ adds three points cold senders miss:

• The 5,000 count covers "all messages sent from the same primary domain," subdomains included.

• "Senders who meet the above criteria at least once are permanently considered bulk senders."

• "Starting November 2025, Gmail is ramping up its enforcement on non-compliant traffic," including "temporary and permanent rejections."

The same FAQ says the guidelines "don't apply to messages sent to Google Workspace accounts." Prospects on Workspace domains fall outside these requirements, but spam filtering still applies to them. Keep personal Gmail addresses out of B2B lists or send to them separately: see cold email to personal Gmail addresses.

FAQ

How many emails can I send per day with Google Workspace?

Up to 2,000 messages per user a day on a paid account and 500 on a trial, with at most 10,000 total recipients and 3,000 external recipients a day. The limits run over a rolling 24 hours.

How long does a Gmail sending limit block last?

Google says users "can't send new messages for up to 24 hours" after hitting a Workspace limit. For a free Gmail account, Google says you should be able to send again within 1 to 24 hours.

Can I increase Gmail sending limits?

Google's pages describe no way to request a higher limit. Workspace trial limits rise after you convert to paid and your domain has paid at least $100 in total, which can take up to 75 days. The SMTP relay service has separate, higher per-user limits.

Is there a per-hour sending limit in Gmail?

Google publishes no hourly limit for Gmail users. Sending too fast triggers receiving-side rate limits such as 421 4.7.28, which depend on your IP and domain reputation rather than a fixed number.

How many cold emails should a Google Workspace mailbox send?

We recommend up to 25 cold emails per mailbox a day, not counting warm-up, after at least 14 days of warm-up. Scale by adding mailboxes and domains, not by moving toward the 2,000 limit.

Sources

Checked September 2026:

• Google Workspace Admin Help: Gmail sending limits in Google Workspace: 2,000 messages per user a day, 500 on trials, 1,500 for mail merge, recipient limits (10,000 total, 3,000 external, 3,000 unique with 2,000 external, 500 external on trials), per-message limits (2,000 with 500 external, 100 over SMTP, 500 over the API), rolling 24 hours, error messages, up to 24-hour suspension, $100 and 75-day trial upgrade, permanent restriction for spam.

• Gmail Help: Limits for sending & getting mail: free Gmail limit of 500 recipients per message or 500 emails a day, 1 to 24 hours to send again, the bounce-related block.

• Google Workspace Admin Help: Route outgoing SMTP relay messages through Google: relay limits of 10,000 messages and 10,000 unique recipients per user, 100 recipients per transaction, 4.6 million and 319,444 per 10 minutes per organization, counting rules, independence from Gmail limits.

• Google Workspace Admin Help: Gmail SMTP errors and codes: texts of 550 5.4.5, 550 5.7.1, 450 4.2.1, 452 4.5.3 and 421 4.7.28.

• Google: Email sender guidelines: requirements for all senders and for more than 5,000 messages a day starting in 2024, spam rate below 0.3%, consistent sending rate.

• Google: Email sender guidelines FAQ: bulk sender definition by primary domain, DMARC minimum policy of none, permanent bulk status, enforcement from November 2025, guidelines don't apply to Workspace recipients.

Outreach2day mailboxes come with SPF, DKIM and DMARC set up automatically and warm-up included, at $2.50 per mailbox a month.

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