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Send mass email campaigns inside Gmail

  • Over 900 5-star reviews on the Chrome Web Store
  • Used by employees of Uber, Twitter, LinkedIn,, and even Google
Add GMass to Gmail


  • Use Gmail to send mail merge campaigns with automatic follow-up emails.
  • Connect to Google Sheets.
  • Personalize. Schedule. Track opens and clicks.
  • Create email lists based on search results.
  • Send emails as replies to the last thread with each person.
  • The killer feature: set automatic follow-up emails to be sent sequentially until you get a reply.

Mail merge with Google Sheets

Mass email based on search results

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.

Have emails sent as replies

Choose to either have emails sent as new messages or as replies to the last conversation you had with each recipient. The latter will create the impression that you manually replied and typed a message to that recipient individually, which should increase your response rate.


Gmail's Compose window

Compose your message just like any other Gmail message. Include attachments and inline images.

Test mode

Choose to only create Drafts, in case you don't want GMass to actually send emails, or if you want to see what the personalization looks like first.

Google Sheets Integration

Choose a Google Sheets spreadsheet and GMass will pull email addresses and other fields from it. (More details)


Schedule mass emails to be sent later. (More details)

Open Tracking

Turn open-tracking on or off.

Click Tracking

Turn click-tracking on or off. (More details)

Unsubscribe Link

Provide an optional unsubscribe link at the bottom of your emails. (More details)


Campaign level reports that show how many people opened, clicked, replied, and bounced. All reports are now now downloadable in CSV format. Reports show up under the "GMass Reports" Label on the left.

Email List Builder

Extract email addresses just by searching for past conversations in your account.

Automatic Follow-up Emails

Set automatic follow-up reminder emails to be sent until your recipient replies or opens. The best way possible to boost response rates. (More details)

Manual Follow-up Campaigns

Easily send follow up email campaigns to those who replied, opened, clicked, or received, or didn't reply, open, click, or receive, or any combination thereof. (More details)

Reply Management

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

Break Gmail's Sending Limits

Send email campaigns to greater than 500 (or 2,000 for G Suite users) people at a time, using our distribution technology. Send campaigns to up to 10,000 recipients, and GMass will auto-send them over multiple days so you don't violate Gmail's limits (More details)

New messages vs. Replies

Choose whether emails are sent as new messages to each recipient or as replies to your last conversation with each recipient. If you have no prior conversation with a recipient, the email will be sent as a new message. If you do have a prior conversation with the recipient, the email will be sent as a reply, and the Subject of your email campaign will be ignored, since the Subject of the last conversation will be used.


Personalize the Subject and Body with the following insertions: {FirstName} {LastName} and {EmailAddress}. If you connect to a Google Sheets spreadsheet with other columns, you can personalize to your heart's content. {Company}, {City}, {DateOfBirth}, {CouponCode}, and any other column for which you have data can be used. (Complete Personalization Guide)

 Our Story

Ajay Goel

GMass Creator

The GMass Story

GMass was born out of the frustration of its creator, Ajay Goel. While recruiting writers for his other Gmail product, Wordzen, he was disheartened by how difficult it was to communicate with all of his writer prospects at once. He simply needed to inform the five candidates that the position was of the 1099 and not W2 variety, but to his dismay, he had to find each conversation with each editor, hit Reply, and type a personalized message. Ajay has lots of experience building email products, especially mass email products. He also built JangoMail, which was acquired by a private equity group in 2013.