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!
Additional information
PricingFree of charge with paid features
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GMass for Gmail™ will ask for the permissions shown below. Learn more
GMass for Gmail™ will need access to your Google account
This will allow GMass for Gmail™ to :
View your email messages when the add-on is running
Run as a Gmail add-on
Connect to an external service
See your primary Google Account email address
See your personal info, including any personal info you've made publicly available
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Alexis Tinsley
August 25, 2025
GMass has been a game-changer for my email campaigns. It makes sending personalized, automated emails directly from Gmail so simple and effective. The scheduling, tracking, and follow-up features have helped me connect with more people while saving tons of time. It’s reliable, easy to use, and has taken all the stress out of managing outreach. I honestly can’t imagine running my business without it.
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Hansel Joshi
August 23, 2025
I have been using GMass for a month or so. I first started with the free trial and since I liked it for its ease of use and implementation, I decided to go forward with the subscription for a month as I have to send mass e-mails for my applications. Overall, my experience with this tool has been good and there was only one time when I had mistakenly sent mass e-mails without adding the last name of the recipients. If GMass had a feature where it could spot such minor errors and prompt the user accordingly, I believe it could make for an even better tool. All in all, it has to be the best in the market for sending mass e-mails.
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Jaipreet Makked
July 21, 2025
Gmass tool is good to use, its a bit expensive but make's email marketing easy. I like to feature where we can connect it other SMTP servers to send more emails than gmail limit. SPAM solver is also a good feature in this.
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Danielle Bartolo
June 24, 2025
Very intuitive, easy to use and works seamlessly. Analytics were helpful to test out which approaches were getting folks to open the emails and to target folks who are most engaged with follow ups. Support team was helpful with some issues - would recommend and use again!
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Henry Clark
June 23, 2025
Powerful, Reliable, and Game-Changing Email Tool! I've been using GMass for my business outreach and it's been a complete game-changer. The ability to send personalized emails in bulk right from Gmail is incredibly efficient and easy to use. The mail merge feature, scheduling, and email tracking are spot on — I always know who opened or clicked my messages. What I love most is how GMass integrates seamlessly with Google Sheets, saving me hours of manual work. I also connected it with an external SMTP (Mailgun), which helped me bypass Gmail's sending limits and scale my outreach to thousands of contacts per day. Whether you're a marketer, startup, freelancer, or running a sales campaign — GMass is an absolute must-have. Highly recommended! — Henry Clark
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Pooja Mahat
May 28, 2025
GMASS has completely streamlined my email outreach—it's fast, reliable, and easy to use. I started with the free version and was so impressed that I upgraded to Premium to unlock advanced features like scheduling, auto follow-ups, and detailed analytics. It saves me hours every week and has significantly boosted my response rates. Highly recommend it for anyone managing bulk or personalized email campaigns!
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Francisco Peixoto
May 29, 2025
What an amazing time-saving tool! It allows for great precision with my email campaigns and enables direct communication with extensive lists of contacts. The information provided on the dashboard, which includes statistics for each campaign, is invaluable and helps us progressively improve the quality of our marketing strategy. I highly recommend it. I'm not giving it a 5-star rating right now—not because of Gmas itself, but because I haven't used all of its features yet. However, I can foresee raising this to a 5-star review very soon.
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Pick Me! SC
June 2, 2025
Great add-on for managing shelter and rescue partners in our statewide adoption event. Makes everything super easy and organized. I love how easy it is to use personalized fields.
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schyler raadt
July 9, 2025
really awesome tool. i love the spam solver. it's a bit overwhelming. i'd love to have more levels of subscription, like a $5 a month one that has just bare bones mass email.
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MAYANK BISHWAS
July 15, 2025
A mass Gmail sender that's meant to blend in with Gmail - it does what it says on the tin. I had first taken a free trial but was impressed enough to try the subscription within 7 days or so. It's all the features that one can ask for: from mass sending, email validation, A-B Testing, Scheduling... and detailed insights. Plus, the learning curve is low because their UI/UX is smartly blends in with Gmail. But I must hightlight the limit of their SMTP server: You can send ~500/day as allowed by Gmail. To send more tehre's a specific protocol to follow which was not clear to me before sending > 500 emails. But then on reaching out to them for clarity, they were quick and onpoint in helping me out. Highly Recommend!
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