04/04/25 - New! SpinMax - AI-powered automatic spintax on every single email in your campaign 12/16/24 - Meet ColdSMTP - our game-changing cold email sending server 05/12/25 - Spam Solver now gives you AI-powered suggestions to hit the inbox 04/23/25 - New! Dynamic lists - power your campaigns with live Google Sheet data 05/05/25 - New! Set a daily end time for your campaign 06/20/25 - You can now monitor your campaign sending speed in real time 03/21/25 - Get your free Google Sheets CRM - made for GMass 05/08/25 - New - Set a sending order to control which rows GMass emails first 05/01/25 - You can now view/manage the unsubscribes and bounces for your entire team 05/15/24 - You can now keep a strict count of days between auto follow-ups. 05/15/24 - NEW - 2 settings for handling blocks in campaigns & follow-ups 11/05/24 - Add multiple SMTP servers and easily pick which to use 11/29/24 - New! Set a default time zone for better scheduling 11/12/24 - Our open rates are now even MORE accurate than they were before 05/14/24 - New! Add auto follow-ups after a campaign is done sending. 11/06/24 - NEW! Our AI spintax generator creates variations for you right inside GMass 11/07/24 - New - easily clean up your long list of templates in the GMass settings box 05/14/24 - New - Real-time SPF checks when you send a campaign 05/13/24 - Now: Upload a file of unsubscribed addresses. 03/29/24 - New! Add a countdown timer to your campaign to create urgency. 03/29/24 - You can now have ChatGPT write your campaigns for you. 08/30/23 - Replies and bounces are now detected INSTANTLY. 07/18/23 - New Feature! Send triggered emails immediately when a prospect is in their Inbox. 06/22/23 - Achieve perfect deliverability with delivery routes. 03/14/23 - We've launched something big. Reply to emails 10x faster. ×
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The easiest way to send an email campaign

Hit Compose in Gmail, enter your list, subject, and message.

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5-star reviews from 300,000+ happy users

Intro

What can GMass do?

  • Turn Gmail into an email marketing and cold email platform

  • Use mail merge personalization with Google Sheets

  • Verify your list, test links, & fix spam triggers before you send

  • Maximize your deliverability — hit the inbox, not the spam folder

  • Send automated follow-up sequences

  • Break Gmail’s limits — send virtually unlimited emails

Mail merge with Google Sheets

Say goodbye to CSV files. Connect to Google Sheets to send a personalized mass email announcement or newsletter using any of the columns in your spreadsheet.

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Send cold emails

The easiest way to send cold email sequences in Gmail.

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Build your list from existing contacts

Use Gmail's powerful search feature to find messages containing recipients to whom you want to email. Then click the Build Email List button, and a Compose window will load containing the email addresses found in those messages. The only mass email service that does this!

Preview

We send a lot of email. Watch these live stats grow right before your eyes.

Lifetime emails sent: ...
Emails sent since midnight 7/10/2025: ...
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Features

Break Gmail's Sending Limits
Mass Emails in Gmail

Our mass email service can break Gmail's sending limits using our distribution technology.

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Google Sheets Integration
Mail Merge with Google Sheets

GMass will read data live from any Google Sheet and even monitor for new rows and then send emails automatically.

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Reports
Email Reporting Analytics

Campaign level reports that show how many people opened, clicked, replied, and bounced. See reports inside Gmail on your desktop or the Gmail app on your phone.

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Personalization
Personalization

Personalize to your heart's content. Connect to a Google Sheet and personalize with any column, or use basic first and last name personalization without a spreadsheet. Use fallback values. Don't know someone's first name? We'll auto-detect it.

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Automatic Follow-up Emails
Automatic Follow-up Emails

Sending cold email? Set automatic follow-up emails to send in a sequence until your recipient replies. The best way to boost response rates.

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Scheduling
Schedule Mass emails and Mail Merges

Schedule a mail merge for any time in the future, or set it to repeat daily or hourly.

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Manual Follow-up Campaigns
Behavior-based Campaigns

Send to a segment of a prior campaign, like everyone who opened the last campaign, or everyone who didn't click the last campaign.

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Reply Management
Reply Management

Emails received in response to a mass email, including replies and bounces, are automatically categorized for you, preventing Inbox clutter.

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Email List Builder
Email List Builder

Find email addresses deep inside your Gmail account just by searching.

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Add GMass Extension to Gmail GMass requires Chrome

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