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Description from extension meta
A powerful mass email and mail merge system for Gmail.
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Description from store
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
- (2025-07-29) Laxmi Palace Heritage Boutique Hotel: nice software to use. i will not recommended any other except this. Thanks
- (2025-07-29) Laxmi Palace: Have used first time this kind of tool and i love the ease of doing work here
- (2025-07-29) Rebecca Liu: Sent 400 emails in less than a minute! I remember where I would copy and paste email addresses in the field for potential client! Wow what a time waster! Easy to set up the SPF, DKIM and DMARC yourself too to prevent your message for going to spam, Google and Gmass has clear instructions on this which was nice that I didn't need to hire a professional!
- (2025-07-29) Jainam Shah: great extension . good support from technical team .
- (2025-07-29) Presley Kappana: Saved me from sending 800 emails manually to test a products validity.
- (2025-07-29) vishal iyer: An Absolute Game-Changer for Email Marketing! I've been using GMass for past few days months now and it is the best Chrome extensions for anyone who relies on Gmail for outreach or campaigns. The mail merge features are incredibly powerful yet easy to use and it allows seamless integration with Google Sheets. The ability to personalize emails at scale, schedule follow-ups automatically, and track opens/clicks are awesome and can save hours of our crucial time. Highly recommended.
- (2025-07-28) Samantha Davis: GMass has been a useful tool for managing outreach through Gmail. The mail merge features are easy to use and save a lot of time. Still exploring some of the advanced functions, but so far, it’s made my campaigns smoother.
- (2025-07-28) Adela Hadzic: We love this extension. It's saved us so much time and integrates directly through our email system! Would definitely recommend.
- (2025-07-28) Taylor Bazos: Love this extension! It makes it super easy to send mass yet customized emails and has saved me hours of time. Thank you!
- (2025-07-28) Elio Sonic: Very good, they don't care much about my excel format like normal gmail merge do.
- (2025-07-27) Alysson Artuso: The tool to send emails from multiple accounts is very useful, but if you use only one account, you need to be very lucky to send up to 500 emails
- (2025-07-27) Mordy Friedman: It works ok but only sometimes. A times it shows 100 percent opens which is obiouslvy not accurate.
- (2025-07-27) Robert Hunter: Super user friendly and easy to understand how to use the software inside of gmail. Pricing is the best on the market and tracking data is easy to understand. Definitely recommend giving it a go as the price is so low its almost risk free.
- (2025-07-26) Lara Kilpatrick: I installed and used GMass for the first time yesterday and I am so pleased by the whole experience! It was very easy to install (our nonprofit uses Google Suite which made it especially easy), and then it was extremely simple to connect to the Google Sheet with my data, as well as copy and paste the content for the email, and add the merge fields. The campaigns Dashboard is also simple and provides most all the data one might need to understand the success of an email blast. For example: My email had a 100% open rate, which was great to be able to see within 24 hours. I look forward to continuing to use GMass for those times when I want to send a personalized email "from me" to 100s of contacts.
- (2025-07-26) Victor Vaes: I had a pleasant time working with Gmass, the extension operates very nicely and is structured in a logical easy way. I would reccomend Gmass to people who need to send multiple e-mails with a mail merge like function. The extension also had many usefull features that I didn't even know existed but these all turned out to be very usefull, in particular the 'spam checker' function proved as a very reliable and reassuring tool control confirm that my mails where reaching their correct destination.
- (2025-07-26) Legit Realty Solutions: Exceptional tool for any business owner looking for email automation solutions. How easily compatible it is to gmail is such a benefit as well as the great support and links to answer about every question you may have, try them out today! The only reason I am leaving them is because I am looking for a more complete tool (eg. Ringless Voicemails, SMS Campaign, etc.) and even then I'll probably come back!
- (2025-07-25) Reid Scott: Works very well and is super easy to use. Love how simple the interface it would definitely recommend.
- (2025-07-25) Phil Weaver: A top tool in my automation bundle with all the features I need. So easy to construct personalized emails with a little planning, and if that's not enough, they will spin them for you (haven't required the spinner but really like that it's there. They have deliverability expertise. Nudging me along to implement best practices. The follow-up system is good enough. Build it. Forget it and let it run. Great tool!
- (2025-07-25) Jared Winn: The tool took a few minutes to start sending and went off without a hitch. I would highly recommend this tool for cold outbound.
- (2025-07-25) Weinsoft Team: GMass is a great tool for email outreach—user-friendly, efficient, and extremely cost-effective for what it offers. Whether you're sending cold emails or setting up automated follow-ups, the interface is intuitive and easy to master, even for beginners. The only downside is the limitation on the free trial—you can send barely 10 emails per day, including follow-ups, which makes it hard to properly test for serious use cases before upgrading. That said, once you're on a paid plan, it’s absolutely worth it.
- (2025-07-24) leo baker: GMass is perfect bulk email sender, Its makes very easy for us to send emails in bulk thanks gmass.
- (2025-07-24) Alex Dobson: Absolutely game changing tool for anyone doing comms!
- (2025-07-24) Trey Knight: Amazing, no brainer to subscribe after my trial, that's rare. Unlimited campaigns, cold outreach, auto follow ups and more. This thing is simple to use, believe me I'm not a tech wizard. Thank you GMASS you truly make it possible to work smart and efficiently as an AE in the digital media world.
- (2025-07-24) Umama Khursheed: Gmass has always been one of the most convenient and easy to do mail merge option. I always prefer Gmass over other mail merge tools.
- (2025-07-23) Chimamanda Eze: This is an amazing service! I wanted to just use the free trial to see how much value it would add, and I immediately subscribed once I got my first campaign out and its report back. At first, it did seem like there was some bug as the campaigns would not actually send despite hitting the correct button several times. The same error about the mail merge tags that I was using kept coming up each time. When it did eventually send, I was thoroughly pleased with the outcome. In particular, I appreciated the bcc feature still working with the merges as well as the ability to still merge replies to certain recipients in the thread from the original campaign. Yet to find any issues since the first bug I encountered
- (2025-07-23) Ali T Alwatan: Great tool to use, saves time and makes marketing my business more efficient and allows me to do more in less time. Not many tools like this out there that you can trust that are easy to use and affordable
- (2025-07-23) Dr. Tinita K.: Makes my life 1000 times easier and is simple to use for what I use it for. Wish there was a cheaper lower level subscription for those of us who only need to send individualized mass emails without any other bells/whistles. Still recommend!
- (2025-07-23) Tiffany Mann: Absolutely love this. To be able to have all the information gathered into one spread sheet and it pull the data out into multi personalized email for one message is amazing. Saves so much time and I can review how many people open and read it.
- (2025-07-23) Jesus Rodriguez: I really like GMass. It is the most effective tool I have found for sending email campaigns in Gmail. Everything works great, and I have never had any problems. I highly recommend GMass if you need to send emails to many leads. From now, no major problems and works 100%
- (2025-07-22) rieno sports: i Love GMass its easy to use and very simply we can send bulk emails and very easy to followup definitely try it out!
- (2025-07-22) Ela Jablonska: I just bought the premium package, I am really happy with the results. This program is user friendly and makes mass emailing a breeze. I recommend it.
- (2025-07-22) Jessica Barrett: Great service
- (2025-07-22) Yacine GUEDOUANI: Great app, easy to use, and much cheaper than Instantly and other competitors. I only wish it was a bit easier to track the campaign performances, A/B testing etc. Otherwise, great app to use if your outreach campaigns aren't really complex
- (2025-07-22) Patricia Apple Andoy: I used GMass in my previous role and continue to use it in my current company. It's very easy to use!
- (2025-07-21) Mark: I recently started using GMass for my mail merges. What stands out for me is the ease in using in and the tutorial's when needed. As I am sending out links in the message the "campaigns dashboard" helps tremendously to track who's opened the email and clicked on the link. This makes follow ups much easer to do! When looking at the user experience it is Simple to use and is great for campaign management. I have used other mail merge apps and GMAss is hands down the BEST!
- (2025-07-21) Clear Debts Plan: Gmass works really great !! Would recommend this to everyone.
- (2025-07-21) Nabeel Amjad: Still learning But nice
- (2025-07-21) Furniture USA: Best Company for Email Campaign
- (2025-07-21) Jaipreet Makked: gmass tool is good to use, make email marketing easy. I like to feature where we can connect it other SMTP servers to send more emails than gmail limit
- (2025-07-21) EdTech Publishers: I recently used GMass and found it very useful. It’s simple to use, works well with Gmail, and sending bulk emails was smooth. I liked the tracking, follow-ups, and Google Sheets link. Overall, it really helped in my email campaigns. Highly recommend it for anyone doing regular email outreach.
- (2025-07-21) Sales Sales: I seriously don't know what I'd do with out this tool. Super easy. Cost effective. You don't need a fancy tool for cold email just something that works. 100% recommend to any small business running cold email.
- (2025-07-19) Akshay Shrivastav: G mass is good service for small interprises.. great services.
- (2025-07-18) Prabhat Kumar PK: GMass has been a huge help in how I reach out to potential customers and stay connected with them. It’s made email outreach so much easier and more effective. I can send personalized emails to a large list straight from my Gmail, and it still feels like one-on-one communication. What I really appreciate is how it handles follow-ups automatically — no more keeping track manually or worrying about missing someone. Since I started using it, I’ve noticed better email deliverability too, which means more of my emails are actually being seen. The tracking features are super helpful because I get to see who’s opening, clicking, or replying, and that helps me focus on the right people. Overall, GMass has saved me a lot of time and made my outreach feel a lot more organized and productive.
- (2025-07-17) Anupam Gupta: Great tool for getting email campaign done with a lot of follow up features.
- (2025-07-17) Daevon Yarbrough (Yarby): GMass makes tracking and follow up simple. I appreciate that it pairs well with google sheets and gmail.
- (2025-07-17) Orion Grove: Gmass is really good. We use it everyday for our real estate business. We send offers to realtors everyday, all day with gmass. Also, the follow up campaigns are amazing. Love this tool. Wouldn't go without it in our business.
- (2025-07-17) QARAVELI: GMass works perfectly when used correctly, but please note: If you accidentally click the regular Gmail “Send” button instead of the GMass button, your message may be sent as a normal group email. In that case, all recipients will see each other’s email addresses. To avoid this, always use the red GMass button when sending your campaigns. When used properly, the system is powerful, confidential, and extremely effective.
- (2025-07-16) jerry ying: Love everything about GMASS, mainly how it's integrated right into your email workflow. The UX is fairly easy to figure out and work with. The one thing I wish it did was help facilitate with the dedicated tracking domain. Seems like an important component that I'm sure most of us never follow through with because of how involved with.
- (2025-07-15) MAYANK BISHWAS: A mass Gmail sender that's meant to blend in with Gmail - it does what it says on the tin. I had first taken a free trial but was impressed enough to try the subscription within 7 days or so. It's all the features that one can ask for: from mass sending, email validation, A-B Testing, Scheduling... and detailed insights. Plus, the learning curve is low because their UI/UX is smartly blends in with Gmail. But I must hightlight the limit of their SMTP server: You can send ~500/day as allowed by Gmail. To send more tehre's a specific protocol to follow which was not clear to me before sending > 500 emails. But then on reaching out to them for clarity, they were quick and onpoint in helping me out. Highly Recommend!
- (2025-07-15) Kuhiro Library: We’ve been using GMass at Kuhiro Class to send out updates, invites, and personalized emails to students — and honestly, it’s been a huge help! It works right inside Gmail, is super easy to use, and lets us send bulk emails that still feel personal. The best part? The automated follow-ups and open tracking save us so much time. If you’re running a program or managing outreach like we do, GMass is a total lifesaver. — Team Kuhiro Class