GMass: Powerful mail merge for Gmail
Extension Actions
- Extension status: Featured
- Live on Store
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
- 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 ,,,
- Anonymous
- I used GMass for the first time for work. And it worked like a charm. Its was easy to install, the google sheet integration works like a charm and the notifications about reports whether it was bounced or read helps a lot. Definitely recommended.
- Anonymous
- It's pretty efficient!
- Anonymous
- Love this, makes my marking task much easier! Worth every penny!
- Anonymous
- Have used a couple of times now and can confirm that the emails have been getting through the filters. It is easy to use and effective!
- Anonymous
- Amazing interface and the most effective email softare to use.
- Anonymous
- Simple, intuitive, I found it super easy to use, and effective.
- Anonymous
- Great Tool to shoot mass emails
- Anonymous
- Easiest tool to send bulk mail campaign right from within gmail
- Anonymous
- GMass delivers exactly what most B2B teams need — reliable, scalable email outreach built right into Gmail. It makes personalized cold campaigns, follow-ups, and A/B testing effortless without having to jump between multiple tools. What stands out is the delivery consistency and data visibility — open and reply tracking, bounce reporting, and campaign-level analytics are all clean and easy to interpret. The integration with Google Sheets keeps list management simple, and the mail-merge function saves a ton of time when customizing at scale. Support is responsive, and setup takes minutes. For anyone running partner updates, lead nurturing, or cold prospecting, GMass hits the sweet spot between simplicity and professional control. Pros: Native Gmail integration Reliable deliverability and tracking Easy personalization via Google Sheets Affordable for growing teams Cons: Basic design editor (best suited for plain-text campaigns) Requires discipline with sending limits for large lists
- Anonymous
- This made sending mass emails direct from my Google Workspace a breeze!
- Anonymous
- What a scam. Nowhere, (even on their website they have an article on limits which omits this information) does it say that after the first 50 mails you've reached a hard limit. After going through all the effort of setting it up (based on internet info stating that I will be able to able to send 50 mails a day) I am now deleting it again coz there is no free plan, despite all the info stating that. If I knew in advance there wasnt any free plans I would not have installed and set it up. You should consider updating your website which still states one can send 50 mails per day.
- Anonymous
- I found this tool to be quite ideal for emailing purposes. The software is intuitive, and the learning curve for its various functions is very gentle.
- Anonymous
- Well, it is a good start for us as Masters Custom Patches for our customers to send emails.
- Anonymous
- 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.
- Anonymous
- Gmass is a fantastic tool for sending bulk emails right from Gmail. It’s easy to use, reliable, and perfect for outreach
- Anonymous
- It was a little confusing at first - but well worth the monthly payment in order to keep everything organized. I love how you're able to use text rich emails!
- Anonymous
- Great tool to send Bulk email. Thanks & Regards Finagg Team
- Anonymous
- Easiest tool to send email campaign right from within gmail. Hats off to the team for making it so user friendly. Ditched Instantly for this and I am very happy I did.
- Anonymous
- I have been using Gmass for 1 year. As an agency owner, it is my preferred tool to run email campaigns. Strongly recommend.
- Anonymous
- Great product, it solves the cold email problem.
- Anonymous
- I’ve been using GMass for my email campaigns, and it’s been a great experience so far. My emails are delivered directly to recipients’ inboxes instead of going to spam, which makes a huge difference compared to other tools I’ve tried. The customer support team is responsive and helpful whenever I have questions or issues. One small thing that could be improved is the A/B testing feature. Overall, GMass is a reliable and effective platform for Gmail-based email marketing. Highly recommend it for anyone looking for better deliverability and a smooth user experience.
- Anonymous
- Fantastic organization
- Anonymous
- Back to using GMass - and wow, I forgot how much I loved it! It’s simple, smart, and even tells you exactly what needs fixing on your domain so your emails don’t end up in spam jail. Pro tip: start with a small GMass send to smooth out any kinks or “pesky gremlins” hiding in your setup. Once that’s done, it’s smooth sailing straight into inboxes and genuine engagement.
- Anonymous
- GMass is a great app, I've been using it for about 5 years now. It's the easiest way I've found to send email blasts from GMail.
- Anonymous
- It was recommended by ChatGPT. What I like about it was that I won't need any learning curve to use it. It's just like using typical gmail (that's exactly what i researched for). It's also a good thing that it allows me to use a non Gsuite email to conduct promotional outreach, of course with 500 message limits. The downside of that is that I have gotten my email address suspended once or twice due to sending mass unsolicited messages. But luckily, I was able to easily lift the restrictions. I'm just worried about it happening after I newly subscribe and the email account gets banned permanently. I will have to use our company email to subscribe next time.
- Anonymous
- Thank goodness I found this, otherwise hundred+ hours would have been spent slowly BCC each email address at a time... Works intuitively and the guides are helpful too!
- Anonymous
- I’ve been using Gmass for job applications and follow-ups, and I really like its acknowledgment feature it instantly shows when the HR opened my email, clicked a link, or didn’t engage at all. This helps me understand which applications are being seen and which need a follow-up. A simple but super-effective tool for anyone doing outreach or applying to multiple roles.
- Anonymous
- Love the GMass tool. Its very simple to use and a great way to create mail merges and campaign. It contains good tools to edit and include fields from a spreadsheet or other sources and is extremely easy! Its my preferred tool. Unfortunately I only have a need to send the merges 4x a year otherwise I would be using this on a regular basis.
- Anonymous
- Gmass is saving us $3200 a month! It is a revolutionary game changer and enables us to run 1000 email campaigns within minutes. We continue to respect MailChimp and ConstantContact but both of these companies not only charge an enormous amount per month, they can be compared to cutting down a flower with a large electric saw. Any job that only needs several hundred emails sent out, should use Gmass which is quick and size appropriate for the task.