GMass for Gmail™ - Google Workspace Marketplace

A powerful mail merge and mass email system for Gmail™.

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Listing updated:September 4, 2023

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Overview

A powerful mass email and mail merge system for Gmail™.

Simple and powerful email marketing inside Gmail™.

*Send email marketing campaigns to thousands of email addresses.

*Mail merge with data from Google Sheets™.

*Personalize mass emails based on name, email address, and any available columns in Google Sheets™.

*Schedule mass emails to be sent later.

*Track opens and clicks.

*Send follow-up emails to people that opened, clicked, or replied to a previous campaign, or to those that did NOT open, click, or reply.

*See all reports right in your Gmail account, under the "GMass Reports" Label.

*Create instant recipient lists based on search results.

*Send unlimited emails from your Gmail™ account by connecting your GMass account to an external SMTP service like Sendgrid.

*And the killer feature - emails can be sent as replies to the last conversation you had with each recipient.

Note that the GMass Add-on must be paired with the GMass Chrome extension for full functionality. The Add-on allows you to see statistics on sent emails and add people to your "Unsubscribes" list, but the Chrome extension is needed to launch email campaigns: https://chrome.google.com/webstore/detail/gmass-powerful-mail-merge/ehomdgjhgmbidokdgicgmdiedadncbgf

We're always improving GMass. Stay updated with GMass on the web and social media.

Website: http://www.gmass.co
Blog: http://www.gmass.co/blog
Twitter: http://twitter.com/GMassForGmail

The website at www.gmass.co has screenshots and explanations of all features. You won't find a better mass email and mail merge tool for Gmail™ than GMass!

Any questions? Email our support team at support@gmass.zendesk.com or search our blog for answers!

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PricingFree of charge with paid features

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Jason Law

December 1, 2025

GMass has genuinely transformed the way I handle outreach and email campaigns. I’ve tried a lot of tools over the years, but none integrate as seamlessly with Gmail as this one. The setup was straightforward, and once everything was connected, sending personalised mass emails became incredibly fast and reliable. I especially appreciate how GMass handles deliverability, scheduling, and tracking — all within the familiar Gmail interface. The analytics dashboard is simple but powerful, showing opens, clicks, and bounce data clearly so I can adjust campaigns in real time. What impresses me most is how stable it is. Even with large lists, GMass performs consistently without slowing down Gmail or causing glitches. For anyone running PR, outreach, newsletters, or sales campaigns, this extension saves hours and removes a ton of manual effort. It’s easily one of the most useful productivity tools I’ve added to my workflow.

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Yes

Reshma Murali

December 10, 2025

I have been using GMass for one month, and it has completely streamlined my email outreach workflow. The tool provides accurate tracking of bounce rates, open rates, and unsubscribes, which helps in making data-driven decisions. The real-time tracking dashboard is easy to understand, and scheduling or sending emails to large lists happens smoothly in just one click. GMass also handles deliverability well, and the overall experience has been reliable and efficient. Perfect for anyone who wants simple yet powerful email automation inside Gmail.

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Yes

Santosh BrandEssence

December 10, 2025

GMass has been a valuable tool for streamlining my email outreach within Gmail. Its ability to send personalized campaigns, automate follow-ups, and provide clear analytics makes it ideal for individuals and small teams. The user experience is clean and intuitive, and the support resources are strong. While sending limits and occasional deliverability challenges can appear, especially with new domains, GMass remains one of the most efficient and user-friendly outreach tools for Gmail users. I would recommend it to anyone who needs simple, scalable email automation without switching to a full CRM.

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Yes

Zenesis Corp

November 20, 2025

Installed the GMass Gmail Add-on recently, and it adds useful contact insights inside Gmail, which makes sending campaigns a little easier. The interface is minimal and doesn’t get in the way. The add-on works as expected and integrates well with the main GMass features. No issues so far, good for anyone using Gmail for outreach or follow-ups.

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Yes

Zack C

November 26, 2025

I have tried different tools for email marketing that makes it very difficult to have advanced tools or very expensive pricing, but with gmass I have had the opportunity to do automation of email campaigns connecting my campaign to a google spreadsheet, as well it helps me to do automatic follow up to increase the open ratio and conversion, and make it simple to use html email marketing templates, sometimes idk why my campaigns get paused and they stop, but besides that it has been the best email marketing CRM I have used so far

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Yes

Alan Rust

November 23, 2025

"GMass has become an essential tool in my workflow. I began with the free plan and quickly upgraded once I saw the value. Its effortless integration with Gmail makes managing campaigns smooth and efficient. I strongly recommend it to anyone looking for a reliable email solution."

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Yes

Kevin Metz

November 29, 2025

GMass is fantastic. I needed to do some personalized customer outreach quickly, and I was able to get everything set up and send my first campaign within about 10 minutes. It’s super customizable and has already saved me a ton of time. I used it for customer follow-ups and immediately generated sales, reviews, and overall goodwill. I originally planned to use it for just a month, but I’ll likely stay subscribed because the tool has proven so valuable.

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Yes

Samantha Krot

October 28, 2025

As a real estate agent in NYC, it is really important to stay on-top of leads and make sure that nothing falls through the cracks, and I have found that GMass is an incredible tool to make my job easier and more efficient. The bulk email tool is invaluable, and GMass makes it super easy to pull the right emails from a list and send everything quickly. The follow-up tool is also really helpful for staying on-top of the many emails and leads that I need to manage.

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Yes

Kuwi Office

October 4, 2025

I've used this tool before, and it's by far the easiest mass mailing tool I've tried that still offers plenty of powerful features. I do hope the developers stay careful not to overload it with too many options as they continue improving it. The price is fair, and I appreciate that when I don’t have leads to send, I can pause my subscription easily. Unsubscribing and resubscribing only takes one click, and it’s great that all my data is kept intact when I return. That’s a really thoughtful service.

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Yes

Jayesh Panchal

October 20, 2025

I have been using the GMass Mail extension for some time now, and I have encountered a significant issue with its email tracking feature. When I send an email and check the Sent folder, the extension inaccurately shows that the recipient has opened the email. However, I am aware that I am the one who has opened the email, not the recipient, which leads me to believe the tracking is malfunctioning. This discrepancy in tracking not only provides misleading data, but it also undermines the reliability of the tool for monitoring email engagement. Despite following the instructions for setup, the GMass tracking extension fails to accurately count email opens, which is a critical function for assessing the effectiveness of outreach. I hope the developers address this issue in future updates to improve the functionality and accuracy of the tracking feature.

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