In-Depth GMass Review: Is It Worth It for Cold Email?
If you’re looking up a GMass review, you probably want to know one simple thing: Can GMass actually handle cold email the way you need it to?
GMass works inside Gmail and gives you tools like mail merge with Google Sheets, automatic follow-ups, personalization, list building from your inbox, spam checking, and the ability to break Gmail’s sending limits.
But cold email is not just about sending emails. It depends on deliverability, sending control, and how well your setup handles volume over time.
In review, we’re going to look at what GMass offers, how its features work inside Gmail, and whether it fits real cold email use cases.
Let’s start by understanding what GMass actually is.
What Is GMass?
GMass is a cold email and mail merge tool that works inside Gmail and lets you send outreach campaigns directly from your inbox.
It adds extra features to your Gmail account so you can send cold email campaigns, personalize messages with Google Sheets, set automatic follow-ups, check spam issues, and go past Gmail’s usual sending limits.
Many people use it because they can run all their email campaigns without leaving Gmail.
How Does GMass Work?
GMass works directly inside your Gmail account and adds tools that help you send cold email campaigns. Here’s a quick look at how it works from start to finish.
Step 1: GMass connects to your Gmail account
After you install the Chrome extension, GMass becomes part of your Gmail inbox and adds new options inside the Compose window.
Image source: Gmass
Step 2: It reads your Google Sheet for mail merge
Once connected, GMass can pull your contact list from Google Sheets. It reads every column live and can also watch for new rows.
Image source: Gmass
Step 3: GMass checks your campaign before sending
It verifies your email list, tests your links, and highlights possible spam issues so you can fix them early.
Step 4: It sends your emails through Gmail with its delivery system
GMass sends your emails using Gmail and can help you go past Gmail’s normal sending limits through its distribution technology, depending on your setup.
Step 5: It manages replies and follow-ups
GMass tracks replies, continues sending follow-ups until someone responds, and organizes replies and bounces inside Gmail.
Step 6: GMass shows your results inside Gmail
You can see opens, clicks, replies, and bounces inside Gmail on desktop or the Gmail app.
What are GMass Key Features
GMass comes with a set of features that help you run cold email and mail merge campaigns directly inside Gmail.
Here are the key features it offers:
Break Gmail's Sending Limits
Image source: Gmass
GMass helps you send more emails than Gmail allows. While Gmail limits sending to 500 emails per day (free) and 2,000 per day (Workspace), GMass lets you send unlimited emails. It uses distributed scheduling to send campaigns in batches, making it possible to send thousands of emails (even 10,000+) over time without breaking Gmail’s rules.
Mail Merge with Google Sheets
Image source: Gmass
GMass connects directly to your Google Sheet and pulls data automatically. It can also watch for new rows and send emails when new contacts appear.
Email Reporting Analytics
Image source: Gmass
You can see opens, clicks, replies, and bounces in simple reports. All reports show inside your Gmail inbox on desktop or mobile.
Personalization
Image source: Gmass
GMass lets you personalize emails. It also supports basic first and last name personalization and can detect names when missing.
Automatic Follow-up Emails
Image source: Gmass
You can set follow-up emails that send automatically until someone replies. This helps you get more responses.
Email Polling
Image source: Gmass
Add quick one-question surveys to your campaigns to collect simple feedback.
Schedule Mass Emails and Mail Merges
Image source: Gmass
You can choose any time or date to send your emails. You can also repeat emails daily or hourly if needed.
Behavior-based Campaigns
Image source: Gmass
GMass lets you send new emails to people based on what they did before, like who opened, clicked, or did not click your previous email.
Reply Management
Image source: Gmass
Replies and bounces are sorted automatically, so your Gmail inbox stays organized and easy to manage.
Unsubscribe Management
Image source: Gmass
GMass removes people from your list automatically when they unsubscribe, so you don’t have to track it manually.
Bounce Management
Image source: Gmass
GMass spots email addresses that bounce and blocks them from future sends to help keep your list clean.
Email List Builder
Image source: Gmass
GMass can scan your Gmail account and find email addresses inside your messages. This helps you build a list quickly from your existing conversations.
A/B Testing
Image source: Gmass
With the help of the A/B testing feature, you can create two versions of an email, and GMass will test both. The version that performs better becomes the one GMass sends to the rest of your list.
SMTP Integration
Image source: Gmass
If you need to send a much larger number of emails, you can connect to an external SMTP service. This helps you send far more than Gmail’s limits.
API – Transactional Emails
Image source: Gmass
GMass lets you use its API to send automated emails like order confirmations, alerts, or notifications through your Gmail account.
Email Verification
Image source: Gmass
GMass checks every email address before sending and removes bad ones to lower your chances of bouncing.
Email Templates
Image source: Gmass
Any email you create can be saved as a template. You can use it again later or share it with your team to save time.
What Are the Limitations of GMass?
GMass is helpful inside Gmail, but there are a few things that might feel limiting when you compare it with other cold email tools.
- Gmail-only platform
GMass works only inside Gmail, so other email providers are not supported. - Gmail’s limits still control how much you can send
Even with your Gmail account setup still decides your final sending capacity. - No deeper email infrastructure features
There’s no DNS setup, SPF, DKIM, DMARC, or mailbox management built into GMass. - Working with a team isn’t very smooth
Sharing campaigns or analytics across multiple users isn’t as easy as in team-focused tools. - There’s no warmup or reputation support
GMass doesn’t include warmup, so users need to be careful with sending. - Follow-up options are limited
GMass allows up to 8 follow-ups, and once they’re scheduled, you can’t stop them easily. - Campaign controls are minimal
You can’t archive or delete campaigns, and templates aren’t very customizable.
What Are the Limitations of GMass?
- Gmail still decides how much you can send
GMass can manage bigger campaigns, but Gmail’s own limits still apply. Your account type, age, and reputation control your real sending capacity. - There’s no domain or DNS setup built in
GMass doesn’t handle SPF, DKIM, DMARC, or custom tracking domains. All of that has to be managed outside the tool. - There’s no warm-up or reputation tracking
You don’t get mailbox warm-up, domain health checks, or reputation monitoring. You have to be careful with volume and lists on your own. - Scaling means adding more Gmail accounts
If you want to send more, you need more Gmail inboxes. GMass doesn’t create or manage mailboxes or domains for you. - Team use feels basic
GMass has team plans, but teams get limited control over shared campaigns, user access, and visibility into each other’s results. - Follow-ups have a hard limit
You can add up to 8 follow-ups, and once they’re scheduled, it’s not easy to pause or change them mid-way. - Campaigns are hard to clean up
You can’t archive or delete old campaigns, which makes long-term organization messy. - Personalization depends on Google Sheets
Advanced personalization works only through Google Sheets. There’s no deeper logic beyond spreadsheet data. - It’s not a CRM or full outreach system
GMass focuses on sending emails. There’s no lead scoring, advanced segmentation, or workflow automation.
GMass Pricing
GMass has different plans for individuals and teams, with monthly and yearly options.
Individual Plans
The individual plans come with the full GMass experience inside Gmail. The main difference is the level of features you get.
- Standard – $25/month ($215/year)
Includes all the core features like unlimited emails*, unlimited campaigns, personalization, verification, tracking links with SSL, Spam Solver, sequences, API access, A/B testing, triggered emails, Inbox Rotation (MultiSend), and high-priority support. - Premium – $35/month ($300/year)
Offers everything in Standard with added advanced features listed in GMass’s full feature set. - Professional – $55/month ($475/year)
Includes every feature GMass provides, making it the complete version of the tool.
*Breaking Gmail limits depends on your individual Gmail account configuration.
Team Plans
These are simple per-user plans for teams that want collaboration features.
Why Is GMass Not Enough for Cold Email Campaigns?
GMass runs on top of Gmail, which means Gmail still controls sending speed, batching, and reputation. When campaigns send faster or in larger chunks than expected, Gmail accounts can get restricted or flagged, and you have little control to prevent that.
Cold email today depends on domain reputation and infrastructure stability. GMass does not manage warm-up, DNS, or domain health, so when deliverability drops or emails start landing in spam, there are very few ways to fix the problem inside the tool.
Scaling also becomes risky. As volume increases, users rely on multiple Gmail inboxes and reduce sending to stay safe, which turns GMass into a workaround rather than a reliable cold email system. Because of this, GMass may work for light outreach, but it is not designed for consistent or large-scale cold email campaigns.
Mailforge: A Better Cold Email Infrastructure for Scaling Outreach
Mailforge is a dedicated cold email infrastructure platform that helps you set up domains, mailboxes, and DNS records automatically so your outreach stays stable and delivers correctly.
Gmail-based tools make sending easy, but they don’t give you control over the backend of cold email delivery.
Mailforge gives you automated DNS setup, bulk domain and mailbox creation, unlimited mailboxes, deliverability-focused infrastructure, and domain protection with SSL and masking to manage, scale, and protect your sending setup from the ground up.
Here’s why Mailforge is better:
- It lets you create multiple domains and mailboxes in minutes
You can add hundreds of domains and inboxes instantly, which removes the bottleneck of relying on individual email accounts. - Provides automatic setup for SPF, DKIM, DMARC, MX, and tracking
Every domain you add is fully authenticated without any manual DNS steps, making your setup correct and deliverability-safe from day one. - Built specifically for cold email deliverability
The infrastructure is optimized to keep inbox placement strong, even when sending from many domains or higher daily volumes. - Offers unlimited mailboxes for flexible scaling
You can expand your outreach operation anytime without running into mailbox limits or needing to purchase new provider accounts. - Works with any sending platform you prefer
Mailforge connects easily with tools like Salesforge or any outreach tool, so your workflow stays the same while your infrastructure becomes stronger. - Adds advanced protection through SSL and domain masking
Your domains stay safer, and your sending pattern looks more natural to inbox providers, helping maintain long-term deliverability. - Handles setup in under 5 minutes
The platform guides you through everything, making it easy for beginners and fast for advanced senders to spin up new infrastructure.
Mailforge manages the technical layer behind cold email so your outreach stays scalable, smoother, and deliverability-ready.
GMass vs Mailforge: Side-by-Side Comparison
Is GMass Worth It for Cold Email?
GMass is a good option if you want a quick way to run cold email inside Gmail. It keeps things simple and familiar, which works fine for small outreach.
But when you try to scale, Gmail-based limits and the lack of domain and DNS control can make deliverability harder to manage, which means you may need to compromise as sending volume grows.
Cold email works best when you have full control over your infrastructure, your domains, your mailboxes, and your authentication setup.
Mailforge gives you the infrastructure for the cold emails, with automated DNS setup, unlimited mailboxes, and 3x better deliverability than Gmass
Get Started with Mailforge!