One button to send any kind of email campaign.
GMass sends your newsletters, announcements, cold email campaigns, and transactional email from inside Gmail.
What brings you here?
Describe what you're trying to send, who you're trying to reach, or the problem you're trying to solve. We'll point you toward the GMass setup that makes sense.
Probably the same thing that brought 400,000 others...
From solo operators to people at some of the most recognizable companies in the world, GMass shows up in a lot of inboxes. Including some familiar ones.
...and guess what?
Shhh!Other email service providers use us too...
...but do they like us?
You don't have to take our word for it. Read what people actually wrote where they installed or reviewed GMass.
We never ask people to write positive reviews. These reviews are organic.
to send newsletters, announcements, cold email campaigns, and transactional email...
Start with what you're sending. GMass handles each use case with the right settings and safeguards.
to 50 people—or 50 million...
The same basic workflow works at radically different scales. A tennis league, a daily outbound operation, and a company-wide announcement can all start from the same Gmail Compose window.
even when things get a little weird...
The weird things that happen five minutes before — or five minutes into — a campaign are where ten years of product decisions start to matter.
but all that power means GMass isn't for everyone...
GMass isn't a Step 1, enter a campaign name; Step 2, enter your subject line kind of tool. We give it to you all at once.
If you want a wizard that reveals one setting at a time, GMass may feel like too much. If you want the controls right there when you need them, that's the point.
and since we're being upfront, let's talk about deliverability...
We guarantee 100% of your email will go to the Inbox, you'll get a 80% open rate and a 50% reply rate!
Our mantra is simple: deliverability is a shared responsibility. You control some of the things that determine where your email lands. GMass is responsible for others. The best results happen when both sides do their part.
because for all that power, there's a teeny tiny learning curve...
If you know how to use Gmail, then you know how to use GMass.
- Open Compose.
- Add recipients.
- Write your email.
- Instead of clicking Gmail's blue Send button, click the GMass button to send it as a campaign.
There’s much more you can do when you want it — personalization, mail merge fields, follow-ups, analytics, deliverability tools, and more. But sending a GMass campaign can be as simple as these four steps.
and what you get is a platform that's at least 20% better than your current one...
Not ten times better. Just better in the ways that matter every day — clearer dashboards, better analytics, faster sending, and lower cost.
with AI where it's useful, and your where it's not...
Don't use AI to write your campaigns -- everyone will know. But use it to improve it and understand it.
Hi there,
Our Fall Collection goes live tomorrow at 9 AM with limited-release outerwear, updated essentials, and early-access pricing for subscribers.
We’d love to see you there.
- Ava
Your campaign is image-heavy. Consider reducing the number or file sizes of images and keeping more of the message as live text.
Your DMARC policy is set to p=none. After confirming all legitimate senders pass authentication, consider moving toward quarantine or reject.
Several links redirect through different domains. Use a consistent branded tracking domain and avoid unnecessary URL shorteners or redirect chains.
This domain’s recent sending volume is much lower than this campaign. A more gradual ramp-up may help mailbox providers build confidence in the traffic.
plus a slightly unhealthy love affair with Google Sheets...
Google Sheets isn't a bolt-on integration in GMass. It's at the center of how lists and personalization work.
Connect a Sheet and each row becomes a recipient, while each column can become a merge field. Names, companies, custom sentences, dates, URLs — whatever you keep in your Sheet can flow straight into each email.
Because GMass reads directly from Google Sheets, your campaign can stay connected to the data you're already working with instead of making you export, import, and maintain another copy of your list.
| FirstName | Company | CustomLine | BookingLink | |
|---|---|---|---|---|
| julia@acme.co | Julia | Acme | Noticed your launch... | gmass.co/demo |
| omar@north.io | Omar | North | Saw your new hiring page... | gmass.co/demo |
| mia@upland.ai | Mia | Upland | Your newsletter caught my eye... | gmass.co/demo |
Hi thereFirstName,
a short custom intro goes hereCustomLine
I thought GMass might be a good fit for your team.
If you're curious, here's a link: insert linkBookingLink
— Ajay
and a bunch of ways to connect GMass to everything else...
API, webhooks, Zapier, the Sheets API, and SMTP relay give you five different ways in.
And with AI and vibe-coding, you don't have to think of yourself as a developer to use them.
POST /api/campaigns
campaign finished → your app
GMass → CRM
Sheet row → campaign
smtp.gmass.co
which is exactly why we're our own biggest user...
We’ve sent over 50 million emails with GMass, to run GMass.
We run the email infrastructure for all of our companies on GMass. We use it for announcements to our users, cold email to prospects, and transactional messages like “Thanks for subscribing,” “Why did you cancel?” and “Your email campaign has finished sending.”
That means we depend on GMass for the same kinds of email our customers do — every single day.
and have been inventing better ways to send email for 10+ years...
GMass has been building and iterating since 2015. Here are a few of our inventions.
Send transactional messages from the same Google account you already use.
Use Google delivery when it fits and SMTP infrastructure when it doesn't.
Tracking approaches designed to survive common blocking techniques.
Compose where you already write email, then add GMass controls directly there.
Links that look good when you hover over them.
AI tells you what's working, what's bouncing, and how to fix it.
Search your Gmail account for anything and build a list off it.