GMass: Powerful mail merge for Gmail
Extension Actions
- Extension status: Featured
A powerful mass email and mail merge system for Gmail.
The easiest way to transform Gmail into a cold outreach, email marketing, and mail merge platform.
** Join the almost 400,000 others who’ve given us an average of 4.8 out of 5 stars **
No credit card required + send 50 emails per day free during your free trial!
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Key features
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* Send cold email and email marketing messages to thousands of addresses
* Unlimited contacts, campaigns, AND emails
* Mail merge personalization with data from Google Sheets
* Personalize each mass email (even send personalized images and attachments)
* With GMass MultiSend's inbox rotation feature, you can distribute your campaign across multiple accounts!
* Hit the inbox, not the spam folder. 99% of GMass users report the best deliverability they’ve ever had.
* Spam Solver - test messages before you send to find spam rates, then use suggested tweaks to improve
* Send auto follow-ups based on opens, clicks, and replies. NEW - Send any stage of follow-ups on demand.
* ChatGPT campaign creation — generate an entire email campaign, follow-ups, and GMass settings by typing in a prompt
* Automatically skip sending emails and automations on holidays, and choose custom days of the week to send/not send a campaign
* Send triggered emails that go out automatically when a recipient opens or clicks — reach your prospects when you know they're in their inbox
* Automate your outreach by automatically sending to new contacts in your Sheet using GMass's recurring campaigns
* Connect your CRM or other apps using the GMass API or Zapier
* Track opens, clicks, and replies — with instant reply and bounce detection. No more delays; see replies and bounces in your report in a matter of seconds.
* Free email verification — verify email addresses before you send your campaigns
* Set DKIM through GMass for authenticated sending with a SMTP server.
* Help with the new Google/Yahoo bulk sender requirements is here - https://www.gmass.co/blog/gmail-bulk-sender-guidelines/. We've also created a one-of-a-kind system to help users with free Gmail addresses sending campaigns via a SMTP server pass DMARC - https://www.gmass.co/blog/gmail-smtp-dmarc/
* Emails can be sent as replies to the last conversation you had with each recipient
* Unsubscribe and bounce management to automatically process unsubs/bounces, suppress future messages to those addresses, and more.
* Hundreds of other features: Schedule emails, throttle sending speed, custom tracking links with SSL, A/B testing, spintax for varying up your copy, quick email polls with custom landing pages, add a countdown timer to emails, drip campaigns, HTML editing, use Gmail's built-in layouts for email marketing, 1-click replies, reusable templates, one-click social media sharing of campaign results, and so much more
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Keep up with GMass
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Website: https://www.gmass.co
What makes GMass different/better? https://www.gmass.co/blog/what-makes-gmass-better/
Quickstart guide: https://www.gmass.co/quickstart-guide
Blog: https://www.gmass.co/blog
Twitter: https://twitter.com/GMassForGmail and https://twitter.com/PartTimeSnob
YouTube: https://www.youtube.com/gmass/
Support: https://gmass.co/g/support
Latest updates: https://www.gmass.co/updates
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How does GMass compare to other Gmail extensions?
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Mixmax: cool extension, but you have to use its external web portal to send campaigns. With GMass, the magic happens inside Gmail, using just the red GMass button.
Yesware: similar to Mixmax, you can't send campaigns inside Gmail. You have to use their web interface.
Plus, both Mixmax and Yesware are more expensive than GMass.
Mailtrack and Snov.io: Lets you track individual emails, but with GMass, you can eliminate Mailtrack and Snov.io because GMass can track both individual emails and campaign emails. Use the GMass button on both one-on-one emails and campaigns.
Copper: Good CRM system, but not meant for sending email campaigns. Same for
Gmelius and Streak CRM.
Lastly, GMass works seamlessly with Grammarly to ensure your campaigns contain perfect prose and are error-free.
Latest reviews
- Anonymous
- I wanted a solution to avoid manually sending emails to 68 potential clients. I'm glad Claude suggested GMass, and once I got my head around the workflow, it has saved me hours of manual labour.
- Anonymous
- I've only been using GMass for a couple of days but I'm impressed by it's features, how intuitive it is, and how easy it is to navigate. As someone in digital PR, it's made it so easy to track all my campaigns and email sends. I'm surprised I never heard of it until now! Would recommend 10/10
- Anonymous
- I've found using GMass very simple and quick. All I do is export my contacts into Google, import it into a spreadsheet, and GMass finds it no problems. It's helped me to keep my student list more organized. I have no complaints about this. I also appreciate the feedback it gives if there was an email that no longer exists.
- Anonymous
- 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.
- Anonymous
- 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
- Anonymous
- Best email blasting software highly reccomend it !!
- Anonymous
- Gmass really changed since last time I used it. More better than other alternatives, cool thing that gmass care about limits, and always let you know clearly what can ruin your reputation. Love it
- Anonymous
- Great Tool!
- Anonymous
- It's a great tool for the marketing, works nicely and has pretty much of options!
- Anonymous
- Great tool for managing outreach even at a small scale.
- Anonymous
- "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."
- Anonymous
- Game changer
- Anonymous
- I've been using Gmass quite a while now starting from their plan now to their paid plan. What i like the most is how it integrates freely into gmail. Very seamless and Nice. I recommend this for anyone wanting to try
- Anonymous
- Quick and Easy! Love it
- Anonymous
- They've really helped scale my cold email outreach and it's very easy to use.
- Anonymous
- This tool helped me a lot in my sales process. Highly recommended!
- Anonymous
- Perfect tool for e-mail campaings! The support is very good! Highly recommend.
- Anonymous
- I started using Gmass a few days ago, and it's pretty easy to get the hang of, and it does what I expect it to do. So far, I recommend it!
- Anonymous
- I've just started using Gmass and it has been very convenient for cold outreach. There are enough stats to really judge the performance and the auto follow up feature has increased my open rate significantly. However, It would be good if they could add an analytics view in the dashboard for all the auto follow ups rather than having to go to the individual report in the inbox everytime.
- Anonymous
- Simple, Fast, and Very Useful for Outreach I’ve been using GMass for quite some time, and it’s been surprisingly efficient for sending personalized outreach emails directly from Gmail. The mail merge features are straightforward, and the scheduling is reliable. I like that everything works inside Gmail without needing a separate dashboard. Still exploring all the features, but so far it does what it promises and saves me time. A solid tool if you work heavily with cold emails or newsletters. I have upgraded my plan now to try the email sequence and automated follow up.
- Anonymous
- Good mail merge tool. Better than others I've used in the past, including Yamm. The one issue is when you upload a new file to google drive to parse with this tool, there is a bit of a lag time before that file becomes readable. But outside of that I found this quite effective, fast and intuitive. Would recommend.
- Anonymous
- GMass works exactly as advertised. Easy setup, reliable sending, and the mail-merge from Google Sheets saves a lot of time. The deliverability has been noticeably better than other tools I’ve tried. Solid extension
- Anonymous
- Gmass is just an awesome tool to carry forward your emailing in bulk order. I would suggest everyone to try it for saving your time.
- Anonymous
- thanks to Chat, I found Gmass. Gmass is much simpler and user-friendly than all the other emailing softwares. straight to point, integrated with gmail, and ive saved a ton of time on the learning curve. thank you Gmass for being simple.
- Anonymous
- Have tested it before purchasing and seems to work amazingly. Saves a lot of time and work.
- Anonymous
- Easy to navigate and useful.
- Anonymous
- perfectly matching with my requirement. user friendly and Easy follow up. Thank you so much
- Anonymous
- Gmass is so easy to use and never had any problems.
- Anonymous
- Fantastice and easy to send customized emails to multiple email ids.
- Anonymous
- Easy to install and use.
- Anonymous
- I found GMass to be very easy to install and use. Following directions on how to use it was easy as well. They provide a video on how to use the extension that was super helpful and when I actually tried it, it worked! It has helped me reach more people in a meaningful way and save a TON of time!
- Anonymous
- Highly Recommened! :)
- Anonymous
- It does what it promises and is easy to use. I recommend it.
- Anonymous
- Much better than the alternative I was using. Way more features.
- Anonymous
- GMass is an incredibly powerful email marketing tool that works seamlessly inside Gmail. I love how easy it is to send personalized bulk emails, track opens and clicks, and automate follow-ups—all without needing complex setups. The analytics are accurate, delivery rates are strong, and the interface is simple even for beginners. Overall, GMass saves a lot of time and makes email campaigns extremely efficient. Highly recommended for marketers, small businesses, and anyone managing outreach
- Anonymous
- Works fantastic
- Anonymous
- This tool is really helpful and easy to use. Great work team!
- Anonymous
- I was admittedly very nervous to use GMass; my work thrives with a personal touch and I thought I'd lose that with GMass. I was absolutely shocked to find that it pretty closely walked me through everything the first time out and I didn't lose any of the personality of my work at all! The only reason I'm giving 4 instead of 5 stars is the test feature doesn't show exactly what a recipient would receive and that would alleviate some pressure.
- Anonymous
- Love using GMass. It really helps me streamline my marketing email campaigns and ensure I am reaching the right number of people.
- Anonymous
- Mixed Experience for a Beginner Gmass has potential, but it’s not beginner-friendly. The setup process was confusing, and hitting “send” for the first time felt nerve-wracking. I had to run countless tests before I felt confident enough to email my list. That said, there are some strong features: the sidebar warnings are helpful, and I appreciated the ability to send rich text messages. Ultimately, my emails did go out and looked professional—but the learning curve is steep if you don’t have prior experience with tools like this.
- Anonymous
- GMass is a really smart and efficient tool for anyone sending professional emails through Gmail. I found it super easy to set up and use. The campaign reports, personalization, and scheduling features work smoothly. What I appreciate most is how simple it makes bulk emailing without needing complex software. The support team was also helpful and polite when I had billing questions. Overall, it’s a great solution for small businesses and freelancers who want reliable mass emailing inside Gmail. Highly recommended!
- Anonymous
- I’ve been using GMass for almost four years, and it’s helped me attract many clients through cold email campaigns.
- Anonymous
- it okay but i do not know how multiple gmail account to please need concrete video on it
- Anonymous
- I’ve been using GMass for PR and influencer outreach, and it’s made managing email campaigns so much more efficient. I love how it integrates directly with Gmail — it’s intuitive, reliable, and saves me a ton of time compared to traditional email marketing tools. Being able to personalize mass emails and track opens and clicks right from my inbox is incredibly useful. Highly recommend for anyone doing media pitching or brand communications.
- Anonymous
- It's great. Has helped me scale up my cold outreach.
- Anonymous
- Great, for beginners and small teams...could use some CRM like feature.
- Anonymous
- I have only used the free version so far but I am amazed by the analytics and follow up features. I can save a lot of time by just clicking one button and I can also save my email lists. Its quite helpful.
- Anonymous
- Installation initially seemed to work but did not show the icons in gmail where expected. The help was limited to articles which offered unconfident old-school solutions (try reinstalling, etc.). As I was ready to move on to another product, I tried a reinstall in a way that was not obvious and that worked. The user interface to a Google spreadsheet is difficult to navigate with confusing or misleading language.
- Anonymous
- Love mail merge and link tracking features for marketing!
- Anonymous
- i used G mass from 2 ids and taken subscription it was very much impressive i increased my business reach to many cities through G MASS thanks G MASS its really nice thanks once again ,,, i used G mass from 2 ids and taken subscription it was very much impressive i increased my business reach to many cities through G MASS thanks G MASS its really nice thanks once again ,,,