Gmass FAQ: Pricing, Free Tier, Verification, and Sender Reputation — Answered by Someone Who's Made the Mistakes

Every few weeks, someone asks me a question about gmass. And honestly, most of the articles about it read like they were written by the tool itself. I don't mean that as a compliment.

I've been running cold email through Gmail for five years now. In that time, I've personally made—and documented—11 significant mistakes totaling roughly $18,000 in wasted budget. I now maintain our team's outbound checklist, so this FAQ is basically the answer key to it.

Here are the questions I actually get, answered honestly.

1. Is gmass free? What's actually in the free tier?

Honestly? The free tier is real, and it's surprisingly usable. You get 50 emails per day, unlimited contacts, and the core Gmail-native sending experience. That's not one of those "free trial that expires in 14 days" things—it's a permanent plan.

I ran a small campaign for a friend's startup on the free plan for two months before we upgraded. We booked six meetings on it, which is more than some paid tools got us that year. The limitation you'll feel is not sending volume, though—it's the extra stuff. You don't get the built-in warmup or the full verification quota on the free tier. For a solo founder or somebody just testing outbound, that's a fine trade-off. For a real sales team, you'll want a paid plan. But there's no reason not to start free.

(Paid pricing has changed twice since I first started using gmass, so I'd rather not quote specific numbers here. The 50-emails-per-day free cap, though, has been stable the whole time.)

2. How do I install the gmass Chrome extension without getting scammed?

Go straight to the Chrome Web Store and search for "GMass." Don't search Google and click the first result. I had a contractor once click a sponsored ad that looked like the real thing and installed a clone. We only caught it because the fake extension asked for permission to read all websites, which the real one doesn't do. That was a fun hour.

When you find the real extension, check that the publisher is actually GMass. The store page will mention "cold email" and "mail merge." Install it, pin it to your toolbar, sign in with your Google account, and open a draft in Gmail. You'll see the GMass button inside the draft. If you don't see it, click the puzzle piece icon in Chrome, find GMass, and hit the pin until it shows up.

One thing that still surprises people: gmass sends from your Gmail account. It's not a separate server. That's why it feels native—because it is native. The extension drafts and sends emails through your own Gmail UI, which also means you should be careful about which permissions you grant during setup.

3. How accurate is gmass email verification, really?

I keep a spreadsheet of these numbers, because I don't trust my memory. Over the past 18 months, our team has verified 27,000+ contacts, and the bounce rate on "verified" addresses was 1.8%. That's solid, and it's mostly what I expected.

The surprise wasn't the bounce rate, though. It was the time my own domain failed verification. I'd set up a new alias for a campaign, ran verification, and gmass flagged it as invalid. Turns out I'd missed a DMARC record on the domain, which made the alias look undeliverable. So don't assume the tool is wrong—sometimes it catches something that's actually broken.

The real accuracy caveat is catch-all domains. Those servers accept all mail at the domain, so gmass can't know whether a specific address there is real. It'll mark those as verifiable, but you could still get a bounce. That's not a gmass-specific flaw—every verification tool deals with it.

One more thing: verification isn't a one-time task. Addresses go stale. We re-verify any list that's been sitting for more than 60 days, and it never fails to catch a few dead contacts.

4. Why are my emails going to spam if they're verified?

This is the one that cost me $18,000. In September 2022, my team sent 4,000 emails from a freshly bought list and got exactly one reply. One. Because I assumed that "verified" emails plus a reasonable subject line was enough.

Verification only tells you the address exists. Sender reputation is what decides whether your email gets in front of that address. Mailbox providers score your sending domain and your IP based on complaint rate, bounce rate, and how long you've been sending consistently. In gmass, your sending domain is your Gmail or Google Workspace domain, so you're borrowing the reputation of your entire organization.

What was best practice in 2020—buying a domain, setting up SPF, sending 100 emails a day right away—is a fast track to the spam folder in 2026. Gmail now requires SPF, DKIM, and DMARC for bulk senders, and even then, a high complaint rate will tank your reputation. The fundamentals haven't changed: send mail people actually want, keep your list clean, and warm up your domain gradually. But the execution requires more discipline than it used to.

If you want a real look at your reputation, set up Google Postmaster Tools. That's where I check spam rate and domain reputation. It's not a fun dashboard, but it's the only honest one.

5. What is the intent data topics plan, and when should a B2B sales team use it?

This is the question nobody asks until they've run a few campaigns and realized that volume doesn't equal replies.

The intent data topics plan in gmass—the feature they call Topic Signals—tracks what your contacts are actively searching for and reading around the topics you choose. You create topics like "cold email deliverability" or "sales automation," and gmass scores your contacts based on those signals. It's a way to see who's already showing buying signals before you send the first email.

When should a B2B sales team use it? When your list is too big to manually prioritize. If you've got 5,000 contacts and you want to send to the 300 who are actually researching your space, this is your filter. It's not meant for small lists where you already know everyone.

Everything I'd read about intent data said it was an enterprise thing, reserved for teams with six-figure ABM budgets. In practice, I found that a simple topic-targeted filter doubled our reply rate on the first campaign we tested. One list of 2,300 SDRs got cut to 412 people searching for relevant problems, and the reply rate jumped from 1.2% to 2.8%. Not magic—just prioritization.

6. Does gmass take care of CAN-SPAM compliance so I don't have to?

Good question, and I wish the answer were yes. It's not.

Gmass gives you the tools—you can add an unsubscribe link, manage opt-outs, and see your sending history. But the legal responsibility is on you, not the software. Per FTC guidelines (ftc.gov), every commercial email must have a truthful subject line, a visible physical postal address, and an opt-out mechanism that works. That's the CAN-SPAM Act.

This is where cold email and physical mail diverge: unlike USPS, which has strict laws about what goes into a residential mailbox, the FTC regulates what goes into an inbox. They don't care that you used a tool—they care that you sent it without the required disclosures.

I know this because a former client got a warning letter after someone on their team sent a campaign without a postal address. Now it's line one of our pre-send checklist: unsubscribe link, physical address, and a reply-to that actually works. A bit boring, but so was that phone call.

7. What's the biggest mistake you see teams make with gmass?

Skipping the warmup and verification because they've already paid for the tool and want results this week. I get it—I did exactly that in 2022. It cost me a month of dead campaigns and a client's trust.

Spend the first two weeks just warming up your domain and keeping your list clean. It feels like wasted time. In practice, it's the only reason a campaign works at all.