WarmInbox
Stop Landing in Spam. Start Closing Deals.
Since launching WarmInbox as a Google Workspace add-on, we’ve been focused on one thing—making inbox warmup as effortless and reliable as possible. The goal: help founders, marketers, and small teams get their emails out of spam without needing to understand deliverability tools inside and out.
We’ve been listening closely to early users and recently rolled out a wave of improvements:
Multiple account support: Manage warmup for multiple Gmail addresses from one dashboard
Pause/resume campaigns: Control your warmup flow without resetting anything
User invitations: Invite teammates to manage or monitor accounts
App password updates: No need to start over when credentials change
Cleaner interface: Faster, simpler onboarding and daily use
The billing system is live: Free trial, and subscription management built in
And it all still works through the Google add-on—directly inside your Gmail account.
WarmInbox was built for people who just want their emails delivered. If you're using Gmail (or Google Workspace) for cold outreach or transactional messages, this now runs quietly in the background to improve your sender reputation day by day.
We’d love your feedback if you’ve tried it—and are open to suggestions for getting it in front of more users. Has anyone here cracked early growth with a Google add-on or similar utility tool?
Quick update from our side: after launching the Gmail version of WarmInbox on the Google Workspace Marketplace, we got some great feedback and immediately saw where the friction was.
We built the core functionality to let users warm up any Google account by simply creating an app password, and it works. But the onboarding and sidebar UI still feel too raw, especially for non-technical users.
So now we’re in the middle of a full UX overhaul for the Gmail add-on:
Smoother first-time user flow
Cleaner design inside the Gmail sidebar
Clearer steps for activating warmup (pricing → Stripe → app password)
Better error handling and setup validation
We want it to feel like a native Gmail experience, not a script glued onto the sidebar. Once we ship the update, setup will be seamless, even for users who’ve never heard of app passwords.
We’re still offering a 7-day free trial, and it works with all Google accounts right now. If you’ve tried the add-on and had thoughts, we’d love to hear what confused you or slowed you down; we’re making the experience as polished as the backend engine that powers it.
When we built the Shopify version of WarmInbox, the goal wasn’t just to release another app on a big marketplace; it was to solve a real problem we kept hearing from store owners.
Merchants rely heavily on email for order confirmations, shipping updates, abandoned cart reminders, and promotions. But for many new or smaller stores, those emails weren’t reaching customers at all. Fresh domains, low sender reputation, and spam filters were quietly killing trust before the first sale even happened.
We built WarmInbox for Shopify to fix that. It runs in the background, warming up a store’s sending email address so that order emails land in the inbox instead of the spam folder. No customer should have to wonder if their payment went through, and no merchant should lose sales because an abandoned cart reminder never arrived.
The Shopify app hasn’t taken off the way our GoHighLevel version did, so we’ve even made the price cheaper to make it easier for merchants to try. But we’re still figuring out how to make it resonate more.
If you’re a Shopify merchant or work with Shopify stores, we’d love your input. What would make WarmInbox more useful or appealing for store owners?
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Cool to see you tackling this head-on...
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Have you considered bundling WarmInbox with abandoned cart apps to boost adoption?
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That’s a really smart idea, and honestly, no, we haven’t seriously explored bundling yet, but it makes a lot of sense.
Abandoned cart apps are directly tied to revenue, and if those recovery emails aren’t landing in the inbox, merchants are definitely leaving money on the table. Pairing WarmInbox with those tools could make the value more obvious and immediate.
We’ll look into possible integrations or even partnerships with cart recovery apps. Thanks for the suggestion; this could be a great way to bridge that gap between "email warmup" (which sounds technical) and "recover lost sales" (which every merchant cares about).
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Nice idea. Thanks for creating.
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This is a solid idea, and I appreciate that you’re targeting a real pain point... not just deliverability in general, but that critical moment when trust is built or broken on first contact. Most merchants don’t even realize their emails are going to spam until they start getting chargeback disputes or “where’s my order?” messages.
One angle you might explore is how WarmInbox could visually show its value. A simple inbox placement tracker (before/after), reputation dashboard, or even a “health score” for the sender domain could help non-technical store owners see what’s happening behind the scenes. Merchants tend to prioritize what they can measure.
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That’s exactly the direction we’ve been thinking in, and we actually do have a health score built into WarmInbox already. It tracks sender reputation over time and gives users a simple “inbox health” metric, so they can see the progress instead of guessing if things are working.
You’re right, though; we probably need to lean into that more for Shopify merchants. If they can see their health score improving, it makes the value more tangible and connects the dots between deliverability and fewer “where’s my order?” emails or chargebacks.
We’ve been treating it as more of an internal metric, but framing it as a visible, trackable result could be the hook Shopify users need.
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This is super interesting! I totally get how the Shopify audience might be different from GoHighLevel. It's tough when you know you've got a solid solution but it's not quite clicking.
You're right, merchants are probably more focused on sales and traffic upfront. Maybe it's about connecting email deliverability directly to lost sales and unhappy customers more strongly? Like, "Are your abandoned cart emails actually making it to inboxes and costing you money?"
What's been your biggest hunch so far about why it hasn't resonated as much?
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Thanks for that perspective; you nailed what we’ve been feeling. The Shopify crowd is laser-focused on sales and traffic, and email deliverability feels like a “technical detail” until it’s directly tied to revenue.
Our biggest hunch so far is exactly what you said: merchants don’t realize that poor deliverability could mean their order confirmations, shipping updates, and abandoned cart emails aren’t even being seen. If those messages aren’t landing, it’s not just a tech issue; it’s lost sales, refunds, and support headaches.
On GoHighLevel, agencies already understand concepts like sender reputation and inbox warming, so they “get” the value instantly. On Shopify, we probably need to reframe it to be less about warming and more about the money being left on the table when critical emails go missing.
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When we started working on WarmInbox, our goal was simple: fix deliverability for anyone sending cold emails. But instead of starting with Gmail or a general web app, we launched on GoHighLevel first.
GoHighLevel users were facing a serious problem. They were setting up new domains, running email campaigns, and seeing everything land in spam. The platform didn’t have a built-in way to warm up those inboxes, and agencies were left piecing together solutions.
We built WarmInbox for GHL to close that gap. It gave marketers on the platform an easy way to warm up email accounts, improve sender reputation, and finally get their messages delivered.
Right now, we still can’t warm up GHL’s “dedicated domains,” but there’s progress on the horizon. The GHL team is working on a new email system that will support professional inboxes using custom domains. Once that’s live, WarmInbox will be ready to integrate with it from day one.
That first version taught us how users wanted the setup to feel, what they expected to see in the dashboard, and how to remove as much friction as possible. Everything we’ve built since started with those lessons.
WarmInbox is now live on the Google Workspace Marketplace, and it works with any Google account. If you're sending cold emails from Gmail, you can now warm up your inbox automatically, with zero hassle.
We built it to fix one simple problem: new email accounts get flagged, and your outreach ends up in spam. WarmInbox solves that by simulating real email activity—opens, replies, engagement—that builds sender reputation over time.
Setup is quick. Just create an App Password, connect your account, and you're done. No OAuth flow. No extensions. No guesswork.
We’re offering a 7-day free trial, so you can try it out and see the results for yourself.
If you do give it a spin, we’d love your feedback. What features would make it even better? Anything missing you wish it had? Your ideas genuinely help shape what comes next.
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Congrats on the launch! I’m building a trust tool for freelancers (TestStack), so I relate to the MVP -> feedback loop. How did you validate your pricing model?
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Thanks! I totally get the MVP → feedback loop struggle.
On pricing, we honestly haven’t validated it for the Google version yet. We just launched on the Workspace Marketplace, so right now we’re offering a 7‑day free trial to focus on getting installs and usage before worrying about conversions.
For the core WarmInbox app (outside Google), we based pricing on what similar tools charge but deliberately started lower to make it easy for early users to try it. That gave us a rough signal that the model made sense, but for Gmail users, we’re still in the “listen first, adjust later” stage.
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When we started sending cold emails for our own projects, we ran into a frustrating wall—emails that never reached the inbox. No matter how well we wrote them, they ended up in spam or promotions. Turns out, the problem wasn’t the message; it was the sender's reputation.
New domains and fresh email addresses are guilty until proven trustworthy. Without warming them up, outreach is dead on arrival.
That’s why we built WarmInbox.
It runs quietly in the background, mimicking real inbox activity—opens, replies, engagement—to build trust with email providers. Over time, that trust turns into deliverability. The difference was night and day for us, and we knew others needed it too.
We didn’t want another bloated tool or growth hack. Just something simple, honest, and effective.
WarmInbox is the kind of tool you only notice when it’s not there. But for anyone relying on email to drive growth, it makes all the difference.
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