Gmail Mail Merge Limit 2026: Workspace, YAMM and GMass

If you're about to send a mail merge from your Google Workspace address, you need two numbers: how many emails Google will let you send today, and how many your inbox can send without landing in spam. They're not the same number.

This guide covers the first one in full: the Gmail mail merge limit, the Google Workspace sending limit, and the quotas YAMM, GMass and Apps Script add on top. Then it explains why staying under the limit isn't enough on its own, especially if this is your first bulk send from that inbox.

Figures come from Google's and each tool's own pages, checked October 2026. Google says limits can change without notice.

What is the Gmail mail merge limit in 2026?

On an eligible Google Workspace plan, Gmail's built-in mail merge lets you send to up to 1,500 recipients a day. That sits inside your account's overall Google Workspace sending limit of 2,000 messages a day, so you still have room for normal email after a big merge.

(Google Workspace is Google's paid business version of Gmail, where your address is on your own domain, like you@yourcompany.com. A domain is the part of the address after the @.)

Here are Google's main numbers for one Workspace user:

A few details people miss:

• "Per day" means a rolling 24 hours. It doesn't reset at midnight.
• Gmail's mail merge isn't on every plan. Google lists Workspace Individual, Business Standard, Business Plus, and the Enterprise and Education Standard and Plus editions. Business Starter isn't on the list.
• Personal Gmail is lower. A free personal @gmail.com account can send 500 messages a day, according to Gmail Help.

Why is a new Google Workspace account stuck at 500 emails a day?

New Workspace accounts on a free trial are capped at 500 messages a day, and Google says that cap doesn't rise during the trial. After you switch to a paid plan, limits go up once your domain has paid Google at least $100 in total. Google says this can take up to 75 days after you reach that amount.

So a brand-new account can't jump straight to 1,500 mail merge recipients a day. Plan your first bulk send around 500 a day or less.

For the full picture on trial accounts and what to do in the meantime, read our guide to the new Google Workspace account sending limit.

What are the YAMM, GMass and Apps Script limits?

Each mail merge tool adds its own quota on top of Google's. Whichever number is lower is the one you'll hit first.

YAMM (Yet Another Mail Merge) is an add-on for Google Sheets and Gmail. Its help center says new Workspace accounts sit at 400 a day through the 14-day trial and a warm-up period after it, then move to 1,500. Its quota counts recipients, so one email with two people in Cc uses three. Our guide to YAMM's daily limit explains when you move from 400 to 1,500.

GMass is a Chrome extension that runs mail merges inside Gmail. GMass says a free account can send 50 emails a day through it. A paid plan removes that cap, but Google's limit for your account still applies. GMass can also spread a large campaign over several days so each day stays under your limit.

Apps Script is Google's built-in tool for writing small scripts, for example one that sends emails from a Google Sheet. On Workspace, Google's Apps Script page lists 1,500 email recipients a day (2,000 within your own domain) and 50 recipients per message.

Sending by hand counts too. Every email you send from that inbox, from any tool, counts toward the same Google limit of 2,000 a day.

Which limit applies to you when you mail merge?

The lowest one. Three numbers stack up, and you're held to whichever is smallest:

1. Google's limit for your account: 2,000 a day, 1,500 for Gmail's mail merge, or 500 on a trial.
2. Your tool's quota: for example, 400 on YAMM Pro with a new Workspace account, or 50 on GMass free.
3. What your inbox can safely send today: often much lower than either, if the inbox is new or hasn't sent much email recently.

Say you're on YAMM Pro with a Workspace account you set up last week. Google allows 500 because you're still on the trial. YAMM allows 400. So 400 is your real ceiling. But if that inbox has only ever sent a handful of emails a day, sending 400 at once is still a big jump, which is where number three comes in.

What happens when you hit a Gmail sending limit?

You'll see an error such as "You have reached a limit for sending email". Google says you then can't send new messages for up to 24 hours. You can still read incoming email and use other Google apps, and your limit resets once the pause ends.

Google also notes that accounts that exceed limits can be suspended, and accounts that send spam can be permanently restricted from sending. Hitting the limit once by accident is a nuisance, not a disaster. Planning sends to stay well under it is the better habit.

Why sending up to the limit can still land you in spam

Google's limits tell you the most you're allowed to send, not what will reach the inbox. An inbox that normally sends 20 emails a day and suddenly sends 1,500 looks unusual to receiving mail servers, even if it's within the rules.

Gmail and Outlook decide where your email lands partly on sender reputation: a trust score for your domain and inbox, built from your sending history and how people respond to your emails. A new or quiet inbox has little history, so it hasn't earned much trust yet. Google's own sender guidelines say to increase volume slowly, and that the more you send, the more slowly you should increase it.

Before your first bulk send, check three settings on your domain:

• SPF lists which servers may send email for your domain.
• DKIM adds a digital signature that proves the email wasn't changed on the way.
• DMARC tells receiving servers what to do if an email fails those checks.

All three live in your DNS (the settings that point your domain to the right services). Our free domain checker checks all three and explains any problem in plain English.

What warmup can fix, and what only you control

Warmup builds trust in your inbox. It can't make people want an email they didn't expect.

Complaints matter more than most people expect. Google's sender guidelines say to keep the spam rate shown in Postmaster Tools (Google's free dashboard for senders) below 0.10%, and never let it reach 0.30%. That's roughly one complaint per 1,000 emails as the safe level. Single words rarely send an email to spam on their own, but wording that feels like an ad makes people click "Report spam". Our guide to spam trigger words covers what actually matters.

How many emails should you send on your first bulk send?

Fewer than the limit, and fewer than you'd like. For an inbox that hasn't sent in bulk before, start with a small batch to people who know you, then grow a little each day. Most inboxes need around 4–12 weeks of gradual increases before they're ready for full volume.

Our free warmup schedule tool gives you an estimated day-by-day plan.

For a fuller answer with worked examples, read our guide on how many emails you can send a day without landing in spam.

Before you hit send

Before you hit send

• Check your real ceiling. Note your Google limit (500 on a trial, 1,500 for Gmail mail merge) and your tool's quota. Plan to the lower one.
• Check your list. Only include people who expect to hear from you. Remove old addresses and anyone who has asked not to be emailed.
• Check your domain. Run SPF, DKIM and DMARC through our free domain checker.
• Check your safe volume. Hitting the limit isn't what sends you to spam; sending more than your inbox has earned is. Warmuply warms up your Google Workspace inbox in the background and shows a daily safe-send number, so you know how many to send today. Start a free 7-day trial.