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A powerful mail merge and mass email system for Gmail™.
Listing updated:September 4, 2023
Works with:
1M+
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
Privacy policy
Terms of service
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
Reviews
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Dr. Anu
June 13, 2025
Super helpful Gmail add-on for outreach! I’ve been using the GMass Gmail add-on for a few days and it’s been excellent. It shows recipient-level details right in my Gmail sidebar, which helps me personalize emails better. The integration is smooth, and the setup was quick. Makes my email workflow much faster and more organized. Highly recommended for marketers and professionals who send bulk emails from Gmail.
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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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PMO Saekyung Phase 3
April 3, 2025
GMass is incredibly user-friendly, especially for those who are familiar with Gmail. The interface feels like an extension of Gmail, making it easy to compose, schedule, and send bulk emails directly from your inbox. GMass offers useful features like email tracking (opens, clicks, replies), automatic follow-up emails, and scheduling. It also supports creating email campaigns with attachments and includes A/B testing to optimize email performance.
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Matt Wilson
April 1, 2025
I loved GMass. I strongly suggest going for GMass as a tool for easy and smooth emailing and follow-ups. Really makes my task so easy that I can get my hours of work done in seconds. Gmass is definitely worth it in terms of convenience and time-saving benefits.
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Christian Barnes
June 11, 2025
GMass is so easy to use. I used it to send out a massive amount of emails using Google Sheets and Gmail. I would recommend this app to anyone that has to send out a large number of emails. Saves Time!
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Vishal Bhawsinghka
March 17, 2025
GMass is a really great tool for cold outreach. Very happy with it. The best part about the tool is that it acts very native to the GMail interface. So it looks and feels as if I have personally emailed the prospect from my address (and not like I emailed from a marketing tool). The from address is mine, their replies land in my inbox directly, and the mass email is indistinguishable from 1-on-1 emails. I think that's the top benefit of using GMass. Also, the entire tool sits within my inbox as silently as realistically possible, which is great. A small area for improvement is that there seems to be a lag between the reporting of some metrics on their main dashboard screen vs when you click the metrics (for eg. emails opened) which shows the actual updated numbers. Not a major issue for us, but it could be relevant for those who need real-time reporting. Overall, the tool seems to be created keeping in mind the needs of cold email outreach and hence does a great job.
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Divya Asrani
June 3, 2025
GMass is the first tool I've used for email campaigning. I have to say, it has made my work a lot easier and automated. Giving 4 stars because I'm still exploring it. But have to say, it's damn cool to use and saves a lot of time and effort. However, just one small thing - I thought from the beginning that the tool was free.
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Jinglan Wang
March 5, 2025
**GMass: A Game-Changer for Business Email Marketing!** We've been using **GMass** for our business email campaigns, and it has truly transformed our outreach! 🚀 ✅ **Easy to Use** – Seamlessly integrates with Gmail, making bulk emailing effortless. ✅ **High Deliverability** – Ensures our emails land in inboxes, not spam folders. ✅ **Powerful Automation** – Follow-ups, scheduling, and personalization make campaigns more effective. ✅ **Affordable & Scalable** – Perfect for small businesses and large enterprises alike. If you're looking for a **reliable, efficient, and cost-effective** email blaster, GMass is the way to go! Highly recommended! ⭐⭐⭐⭐⭐
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