GMass Warmup: Get Your Inbox Ready Before You Send

GMass makes it easy to send a large mail merge from your own Gmail inbox. What it can't do is give a new or quiet inbox the sending history Gmail and Outlook look for. That's what GMass warmup is about: getting you@yourcompany.com trusted before your campaign goes out, so it lands where people will read it.

This page is for anyone using GMass with a Google Workspace address on their own domain. It covers why warmup matters for GMass sends, how to set GMass up with Warmuply in a few minutes, and what warmup can't fix on its own.

Does GMass warm up your inbox?

GMass sends your campaigns and has strong tools for checking them, but building your inbox's day-to-day sending history is a separate job. GMass's own guide to sending limits notes that a brand-new Google Workspace account, on an organization new to Workspace, has very limited sending ability at first.

Google's official limit is 2,000 emails a day per user, or 500 on a trial account. That's a ceiling, not a target. Google's sender guidelines say to increase volume slowly and avoid sudden spikes if you have no history of sending in bulk. If you go over your limit, Google can block sending from your account for up to 24 hours. Our guide to Gmail sending limits explains how the numbers work.

How to set up GMass warmup with Warmuply

Warmuply runs alongside GMass. Nothing changes in how you write or send. Here's the setup:

1. Connect your Google Workspace inbox to Warmuply. Sign in with Google. It takes about a minute. Warmup starts straight away, sending and receiving everyday-looking emails with our network of inboxes, a little more each day.
2. Fix any domain settings we flag. We check SPF, DKIM and DMARC, the settings in your domain's DNS that prove your email is really from you. If something's wrong, we explain it in plain English and give you the exact text to paste.
3. Check your safe-send number each day. It's how many emails your inbox can safely send today, and it goes up as your inbox warms.
4. Set it as your GMass daily maximum. In the GMass settings box, open the Schedule section and, in the Speed area, set the maximum number of emails per day to your safe-send number. GMass sends that many and spreads the rest over the following days.
5. Add a pause between emails if you like. GMass can wait 5–10 seconds, 10–60 seconds or 1–5 minutes between each email, which looks more like normal sending.
6. Keep warmup running. Your number keeps growing, and you raise GMass's daily maximum to match.

Two GMass settings in the dashboard's "Gmail Limits" section are worth a look while you warm up:

Say you have 300 people to email and today's safe-send number is 80. Set GMass's daily maximum to 80, send the campaign once, and GMass handles the batches. Most inboxes need around 4–12 weeks before sending at full volume. Our free warmup schedule tool gives you an estimated day-by-day plan.

How do GMass's deliverability tools fit with Warmuply?

They work well together, because they do different jobs. GMass checks the campaign you're about to send. Warmuply builds and watches the inbox it's sent from.

If you're still choosing a tool, our comparison of Gmail mail merge, YAMM and GMass covers limits, prices and features side by side.

What warmup can't fix

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

• Who you email matters most. Send only to people who expect to hear from you. Old, bought or scraped lists bring bounces and complaints that no amount of warmup can outweigh.
• Complaints hit hard. Google's sender guidelines say to keep your spam rate in Postmaster Tools (Google's free dashboard for senders) below 0.10%, and never let it reach 0.30%.
• What you write counts. Write like a one-to-one email, keep links to one or two, skip attachments, and make it easy to opt out. Stop emailing anyone who asks. Our guide to spam trigger words covers what actually sends email to spam.

Before you hit send

Before you hit send

• Check your list. Everyone on it should expect to hear from you, and anyone who opted out should be removed.
• Check your domain. Run SPF, DKIM and DMARC through our free domain checker.
• Check GMass's daily maximum. Set it to today's safe-send number, not to Google's limit.
• Let Warmuply do the warming. It warms up your Google Workspace inbox in the background and gives you a daily number to use in GMass. Start a free 7-day trial.