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
- 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.
- Newlands Pharma
- I was previously using Google Mail Merge, but the advanced features were limited and I could only send 100 emails per day. Since switching to GMass, I can now send more than 350 emails per day with much more flexibility. It’s a powerful and easy-to-use tool that has significantly improved my email campaigns. Highly recommended!
- Audrey
- This is the Best app I've used, now seeing conversions
- Rachel Morgan
- I just started using this plugin but it's been really helpful. I'm glad I purchased it. Thank you for making my outreach easier and more deliverable than a traditional CRM.
- ashutosh kumar
- Easy to use and analytics review
- Lucrate Results
- Amazing and fast!
- Logan Brown
- I’ve been using GMass for Gmail for a few weeks to send newsletters and for outreach. The Google Sheets integration makes it easy to personalize emails at scale, and the automated follow-ups based on opens or replies save a lot of time. The only real downside is that Gmail’s daily sending limits still apply, so high-volume campaigns may need a workaround like a third-party SMTP. Overall, it’s a great tool for small businesses or freelancers who want powerful mail-merge and automation features without leaving Gmail.
- Marieke Whitaker
- I just sent my first campaign and WHAT A DIFFERENCE! The ability to personalize emails and the customization of the content of the message is amazing! My open rate increased 3400%!
- Ingi Deutschländer
- Easy to install and set up; have only run two campaigns but so far so good! :)
- Paul Streletsky
- its an amazing software for building automation business emails recomended
- Santosh Salgare
- GMass has been a game changer for my cold outreach. I like that everything runs directly inside Gmail instead of forcing me to learn a completely new platform. The analytics are helpful, and once you understand the sending limits and warm-up process, it works reliably. Definitely a solid tool if you’re doing outreach directly from Gmail and want something simple but powerful.
- Ryan Logan
- Good Good Good. Very good so far. I just launched my first campaign, and am looking forward to more to come!
- Trung Cao
- It has been great. I was afraid something might go wrong, but everything went smoothly
- Amy Metz
- GMass absolutely saved me when I needed to send customized messages to our union members during a ratification vote. I appreciate how straightforward the process was. I was able to send critical information in such a small window of time. Would absolutely recommend!
- Rajesh Parmar
- GMass is the best for small businesses like mine. With a reasonable amount I am able to reach out to lot of target audience that too with a one shot of email.
- Pulkit Garg
- Using GMass has been a great learning experience. Overcoming the use of email marketing tools, and being able to send mass emails from the comfort of your inbox itself, that's empowering. I would really recommend the same for other marketers.
- Laci Jorgensen
- Once I figured out how to use the "Attachment" feature it was amazing! I watched quite a few videos that made it seem quick and easy but they could have been a little more specific on how to set up your spreadsheet. Like they could have mentioned to not have any columns in your spreadsheet that did not have information you were going to use in your email. I had to play around with it and try a few test emails before I figured it out. Also, adding links to PDFs from Google Drive into the spreadsheet was hard to figure out. I had to manually attach each link into the spreadsheet. But my 827 emails were sent successfully with all the correct attachments going to the correct people.
- Kulothungan Karikalan
- easy to use and tracking is easy
- Rakan Zahed
- Great product!
- Martin Rosemblatt
- Great extension to send mass emails. Works fast and its easy to manage