A mass email
service inside

Get the highest open rates you've ever seen.

Add to Gmail GMass requires Chrome

5-star reviews from 200,000+ happy users


Used by employees of:

  • Uber
  • Twitter
  • Linkedin
  • Google

What can GMass do?

  • Send mail merge in Gmail with Google Sheets

  • Send cold emails with sequences that maximize responses

  • Personalize Emails

  • Schedule emails in Gmail

  • Email tracking reports - Track opens, clicks, replies

  • Validate your list with our built-in verifier to maximize deliverability

Mail merge with Google Sheets

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


Send cold emails in Gmail

The easiest way to send cold email sequences in Gmail.


Mass Email Service in Gmail

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!


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

Lifetime emails sent: ...
Emails sent since midnight 12/3/2021: ...


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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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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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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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

Do people love us or hate us?

Most people love GMass. Every now and then, a curmudgeon doesn't. See our thousands of awesome reviews (click the "Reviews" tab). Still not convinced? Here's why GMass is better.