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
- customer service BO5 41O 5OO3 barg
- A robust email marketing tool that turns Gmail into a full-featured mail merge platform.
- Kaimana Leong
- Worked great for my real estate email blasts. and the follow up is even better!
- Luis Corbe
- This is a very helpful tool. It helps me to send mass emails without a hassle. I was able to track messages as well so in marketing and sales side, I know who to focus on. Worth the money and upgrading if you want simple yet working.
- Info
- Have started using GMass, pretty smooth till now. Let's see how it goes.
- Compta fournisseur
- Fast and reliable inbox delivery
- Christian Gardner
- This is truly an awesome tool for "spray and pray" outreach efforts. I am a cold emailer who is curious about engaging with professionals and I must say this is phenomenal.
- Naicam Homecoming
- This extension was a lifesaver when I was creating a mass campaign for our local Homecoming event. What would have taken me hours, if not days, has taken up significantly less time. Would highly recommend this extension!
- International Journal
- User friendly and fast.
- Omar Cruz
- GMass is a really powerful mail merge tool for Gmail. It works great for running mass email campaigns and makes sending outreach simple and efficient. Emails are delivered instantly to the recipient’s inbox, which makes it very reliable for campaigns and large email sends. Highly recommend for anyone doing email marketing or outreach.
- Mike Rodriguez
- Really simple to get up and running. I needed to send thousands of emails and GMass made the whole process straightforward, the settings are easy to navigate and being able to send from multiple email accounts in one campaign is brilliant for deliverability. I accidentally purchased an annual subscription and the team sorted a refund straight away, no questions asked. Would recommend to anyone doing outreach at scale.
- Eric
- I keep going back to gmass since it's a great tool for follow up and keeping my life easier.
- John Erickson
- I’ve been using GMass for email outreach, and overall it’s a really solid tool—especially if you’re working directly out of Gmail. It’s easy to set up, integrates smoothly, and makes sending bulk emails feel much more natural compared to traditional email marketing platforms. What I like most is how straightforward it is to launch campaigns quickly without needing a complicated setup. It’s especially useful for cold outreach and follow-ups. That said, one thing I’d really like to see improved is the reporting and analytics side. It would be very helpful to have a more structured dashboard where I can easily view weekly and monthly campaign performance—like open rates, replies, clicks, and overall trends over time. Right now, the data is there, but it’s not as organized or visual as it could be for tracking long-term performance. Overall, GMass is a great tool for sending campaigns efficiently, and with improved reporting features, it would be even more powerful. Rating: 4/5
- Prideteam GMASS
- so far so good. i have ben using gmass for a while and i decided to subscribe recently. i havent had any bad experience so far
- Thomas Meier
- Very easy to use.
- Austris Cirulis
- Seems as a really good tool. Helped a lot to outreach various speakers, organizations and to make the automation processes.
- Emma Tailor
- i had tried many other email marketing platform but i had found gmass as one of the best tool.
- Amisha Prajapati
- Best tool for mass email
- Sales Department
- Great Software for cold emails. Has everything you would need from every aspect. You can even schedule campaigns and this is vital in the corporate world where people typically aren't going to read you random email on a Monday morning hypothetically speaking. Has integrated safety features such as not sending to the spam email. It has many more features but it even has a follow up feature and this is critical because a potential client will reply quicker to your follow up then they would the initial email. 5 out of 5 easily and price is more then fair.
- Fan Wen
- Used it today for the first time for a big campaign. It worked pretty well as it allowed me to personalize each email using the input from a Google sheet. Strongly recommend it!
- 김종현
- It was incredibly efficient to use Gmass to automate sending personalized emails and unique attachments to all 100 employees. I highly recommend it for streamlining internal communications.
- Juan Herrero Tejada
- An easy and reliable tool for making email campaigns.
- Khadim Baltistani
- Excellent and afficient email marketing tool
- Pierre Dubois
- Very easy to use.
- Wedding Venue Expert
- Good tool to send email campaigns integrated in gmail.
- Bethany Ridgway
- Works fine for now. but its bit costly
- Lee Benard
- So easy to figure out. Makes sending my campaigns so much easier being able to use Gmail by itself!
- EU Global Admissions (Manoj Bhupathi)
- Good to have this tool to increase reach to the world
- Roberto Baggetta
- Good. But deliverability has been dropping off lately. Great tool though. Well developed.
- Agnieszka Gabriel
- This tool helps me a lot in achieving my goal (finding a job in Iceland and sending emails to potential employers). Totally great!
- Yev Gene
- really good extension if you want build-in Chrome solution for cold emailing. much easier in use, rather other services.
- Cheretta Robson · s
- As an educator, GMass has been an incredibly valuable tool for communicating with students, families, and colleagues. The integration directly within Gmail makes it simple and intuitive — there’s no need to learn a completely new platform. One of the biggest benefits for me is the ability to personalize messages at scale. Using mail merge with Google Sheets allows me to address students by name, reference specific courses, or tailor details without sending individual emails one by one. It saves a tremendous amount of time while still keeping communication personal. The scheduling and automated follow-up features are also extremely helpful, especially during busy periods like registration, advising, or event reminders. I can set everything in advance and trust that reminders will go out on time. The reporting features allow me to see who has opened or responded, which helps ensure important messages aren’t missed. Overall, GMass has made large-scale communication more efficient, organized, and professional. I highly recommend it for educators who need to manage outreach effectively.
- Richard Oliver
- I have been using Gmass on and off for the last 5 years and generally very happy with their service. The reporting is useful in terms of opens, unopened and unsubscribed . Its generally a good solution at an affordable price.
- Duncan Scott
- I've been using Gmass for years now. I've looked at other software, but so far, Gmass is the easiest and most user-friendly and effective for email campaigns.
- Shweta Kadam
- Mails are landing in spam folder
- Alex Austin
- Love this app for media relations - it's super easy. I do wish it had more videos vs. written how tos as sometimes it can take a minute to read through if I am stuck but honestly it's a pretty self-explanatory app!
- Jack Provenzano
- Great
- Jackie Potter
- Gmass has made my life so much easier. I was able to send over 300 emails and landed an agent along with 250 emails for a campaign pitch and allowed me to make each email individualized. I cannot recommend it enough
- Bob Kippola
- Good! Took some time to setup due to a complex scenario on my end, but really cool product and worth the $.
- Michael Omotosho
- Gmass is pretty easy to use and navigate such that i find it stressful using other platforms however, it gets a bit technical where it requires that i set up a tracking domain
- Jack Wright
- I love the simplicity of gmass, although I am using a few more advanced email sending tools but I still enjoy using gmass as it's easy and effective.
- Harkirat Singh
- I strongly recommend GMASS to anyone looking for reliable and high-quality service
- Jordan Pearce
- I really love this chrome extension as I like to stay in contact with my team and also clients and previous mastermind students. GMass makes it so simple. Highly recommended
- Sasha Auguste
- Gmass is an easy to use extension for mass emailing and I would tell anyone who has a business that needs to reach masses to utilize this engine. It works well and gives you live feedback of your opens, replies, and positive outreach. 5 stars!!
- Santuario Digital
- It's a tool that simply does what it promises. It's true that it's a little complicated to use at first, but once you learn it, it's very easy. I recommend it for email marketing.
- Abe Lozada
- The setup is intuitive, the campaign reports are detailed, and the scheduling and follow-up features work seamlessly. Highly recommended for teams running large-scale email campaigns.
- Carrie Malangone
- Gmass has been a blessing in disguise. After realizing that gmail only allows so many outgoing emails a day I had to find something that would allow mass emails for my business. I am not tech literate so it was hard for me to try to set it up on my own so I reached out to GMass and they were just awesome helping me. Very responsive and knowledgable. I only gave a 4 star just because the pricing is too much for the amount I send out each month. Otherwise Gmass is great!
- Shayan Khurram
- The thing that stands out for me is how much clarity you have while using gmass a simple and easy interface really gets the job done.
- SCIENTIFIC SOCACON2026
- Its awesome!! Saves lots of our time when sending customised bulk mailing...
- North Starz Group
- Gmail Express was incredibly helpful for my radio campaign. The platform made it easy to coordinate messaging, manage communications, and stay organized throughout the entire process. It streamlined our outreach and helped ensure everything ran smoothly and on schedule. I highly recommend Gmail Express to anyone looking for an efficient and reliable way to support their marketing campaigns.
- Vendora Team
- It was easy to setup and does what i need. I wish i had an easier way to micromanage the campaign and remove emails i no longer need to email to.