GMass review (2026): $29.95 plans, no warmup and the real cost

GMass is a Chrome extension that sends mail merges and cold email sequences from inside Gmail, priced per Gmail account from $29.95 a month. It is quick to start for one inbox. It has had no warmup since January 2023, it is bound by Google's sending limits, and at 5,000 cold emails a day through outside SMTP mailboxes the full setup is $658 a month.

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  • Warmup and sending included
  • $2.50 a mailbox, 12 minimum
  • Month-to-month billing

Monthly cost · 5,000 a day, full setup

  1. GMass + Outreach2day mailboxesGMass + Outreach2day mailboxes: $658.28
  2. Outreach2day all-inOutreach2day all-in: $543.33
Entry price
$29.95 a month (Standard, one Gmail account)
Priced by
Per Gmail or Workspace account (or per user on team plans); emails and contacts unlimited
Warmup
None: GMass shut its warmup down on January 31, 2023
Mailboxes sold
None sold
MCP server
No official MCP server found on gmass.co
Trustpilot
2.9 / 5 from 40 reviews

Every line item at 1,000, 5,000 and 10,000 a day

Fit

Who GMass fits

Pick GMass if

  • You send from one Gmail or Workspace account and want to stay in Gmail
  • Your lists live in Google Sheets
  • You want sequences and follow-ups for $29.95 a month
  • You want a short trial with no card

Look elsewhere if

  • You need warmup in the same tool
  • You plan to send from dozens or hundreds of mailboxes
  • You want an MCP server or email support on the entry plans
  • You want a clear refund window

Overview

What GMass is

GMass adds a button to Gmail's compose window: you write the email, point it at a Google Sheet or a list, and GMass sends it as a mail merge with follow-up steps. Every plan sends unlimited emails to unlimited contacts from the account it is on, within Google's limits.

The company is GMass, Inc., a Delaware corporation. It sells no mailboxes or domains and has no lead database; it verifies emails for free and builds lists from your own Gmail.

For more than one account it has MultiSend, which spreads one campaign over extra Gmail or Workspace accounts that need no GMass subscription of their own. Its own pages disagree on the entry plan for it: the pricing page ticks it from Premium, the MultiSend guide says Professional and Team.

Chrome extension that runs mail merge and cold email campaigns from inside a Gmail or Google Workspace account source (opens the vendor's page in a new tab)

Run by GMass, Inc., a Delaware corporation source (opens the vendor's page in a new tab)

Pricing

GMass pricing

List prices from GMass's pricing page, checked . Taxes and card fees excluded.

Add-ons and extra costs

Standard is $29.95 a month and now includes sequences and follow-ups; Premium at $39.95 adds the API, Zapier, A/B tests and triggered emails; Professional at $59.95 adds email and high-priority support. Yearly billing brings them to $20, $29 and $49 a month. Team plans run $175 a month for 5 users to $2,200 for 100.

The less visible line is outside SMTP: sending through any SMTP server costs $5 per 10,000 messages. GMass's ColdSMTP shared server is $99 a month on top of a plan, by application, and a custom tracking domain set up by GMass is $50 once. Every plan and add-on is in GMass pricing.

Full cost

What a full GMass setup costs a month

The cold email sequencer plan the volume needs, plus mailboxes and domains, at 1,000, 5,000 and 10,000 cold emails a day.

1,000 a day40 mailboxes · USD a month
  1. GMass + Outreach2day mailboxesGMass + Outreach2day mailboxes: $179.62
  2. Outreach2day all-inOutreach2day all-in: $108.67
5,000 a day200 mailboxes · USD a month
  1. GMass + Outreach2day mailboxesGMass + Outreach2day mailboxes: $658.28
  2. Outreach2day all-inOutreach2day all-in: $543.33
10,000 a day400 mailboxes · USD a month
  1. GMass + Outreach2day mailboxesGMass + Outreach2day mailboxes: $1,256.62
  2. Outreach2day all-inOutreach2day all-in: $1,086.67
  • GMass + Outreach2day mailboxes

    Keep the sequencer, buy the mailboxes from us

    1,000 a day

    $179.62a month

    $70.95 more than Outreach2day all-in
    5,000 a day

    $658.28a month

    $114.95 more than Outreach2day all-in
    10,000 a day

    $1,256.62a month

    $169.95 more than Outreach2day all-in
  • Outreach2day all-in

    Mailboxes, warmup and the sequencer in one bill

    1,000 a day

    $108.67a month

    • 40 mailboxes at $2.50, warmup and sequencer included: $100
    • 8 domains at $13 a year: $8.67
    5,000 a day

    $543.33a month

    • 200 mailboxes at $2.50, warmup and sequencer included: $500
    • 40 domains at $13 a year: $43.33
    10,000 a day

    $1,086.67a month

    • 400 mailboxes at $2.50, warmup and sequencer included: $1,000
    • 80 domains at $13 a year: $86.67

25 cold emails per mailbox a day and 5 mailboxes per domain: 1,000 a day = 40 mailboxes, 8 domains, 22,000 emails a month; 5,000 a day = 200 mailboxes, 40 domains, 110,000 emails a month; 10,000 a day = 400 mailboxes, 80 domains, 220,000 emails a month (22 sending days). Monthly list prices on monthly billing; .com domains at $13 a year spread over 12 months.

Why each GMass plan

Priced as Professional plus the SMTP fee with Outreach2day mailboxes and domains, GMass is $180 a month at 1,000 emails a day, $658 at 5,000 and $1,257 at 10,000. The SMTP fee grows with volume: $11, $55 and $110.

That is the SMTP route, and GMass does not document rotating hundreds of SMTP mailboxes in one campaign. The route GMass itself describes is Google Workspace accounts rotated by MultiSend, each with a Google seat on Google's bill and warmup bought somewhere else.

Outreach2day all-in is $109, $543 and $1,087 at the same volumes: mailboxes, warmup and the sequencer, with no browser extension and no Google seats.

Terms

GMass features, limits and terms

Each line links to the vendor's page it comes from.

Priced by

source (opens the vendor's page in a new tab)
Per Gmail or Workspace account (or per user on team plans); emails and contacts unlimited

Mailboxes sold

source (opens the vendor's page in a new tab)
Not included None sold

Your own mailboxes

source (opens the vendor's page in a new tab)
Runs only inside Gmail or Google Workspace in Chrome; other providers only as an outside SMTP server

Sending limits

source (opens the vendor's page in a new tab)
Google's limits: up to 500 a day for gmail.com, 2,000 for Workspace per account

Warmup

source (opens the vendor's page in a new tab)
Not included None: GMass shut its warmup down on January 31, 2023

Deliverability tools

source (opens the vendor's page in a new tab)
Partly, or at extra cost MultiSend rotation (pricing page: Premium and up; MultiSend guide: Professional and Team), Spam Solver, free inbox tester with 17 seed addresses, custom tracking domain

LinkedIn, calls, SMS

source (opens the vendor's page in a new tab)
Not included Email only; SMS only as reply alerts

Lead data

source (opens the vendor's page in a new tab)
Partly, or at extra cost No B2B database; free email verification and a list builder from your own Gmail

Integrations

source (opens the vendor's page in a new tab)
Partly, or at extra cost Google Sheets, Zapier and webhooks; no native CRM listed

API

source (opens the vendor's page in a new tab)
Partly, or at extra cost REST API on Premium, Professional and Team

MCP server

source (opens the vendor's page in a new tab)
No official MCP server found on gmass.co

Support

source (opens the vendor's page in a new tab)
Support form tickets, which GMass says it may leave unanswered; email support and high priority only on Professional and Team

Refunds

source (opens the vendor's page in a new tab)
No standard window; refunds only in specific cases such as a wrong account or a plan auto-adjusted

Trial

source (opens the vendor's page in a new tab)
Included 7 days, 50 emails a day, no card; no SMTP during the trial

Features

Other GMass features

MultiSend
Spreads one campaign across extra Gmail or Workspace accounts that need no subscription of their own; only the main account needs a Professional or Team plan source (opens the vendor's page in a new tab)
Google Sheets
Campaigns built straight from a Google Sheet source (opens the vendor's page in a new tab)

In detail

Warmup and sending limits

GMass shut its warmup down on January 31, 2023, so new accounts warm up in another tool or not at all. Each account sends within Google's limits: up to 500 emails a day from a gmail.com address and 2,000 from Google Workspace.

For deliverability it offers the Spam Solver, a free inbox tester with 17 seed addresses and a custom tracking domain. It runs no inbox rotation across SMTP mailboxes beyond the outside-SMTP route.

API, MCP and support

The REST API, Zapier and webhooks start on Premium. We found no official MCP server on gmass.co, so an AI assistant reaches GMass only through the API.

Support tickets go through a form, and GMass says not all are answered; email support and high priority are on Professional and Team. There is no standard refund window: refunds are given in specific cases, such as a charge on the wrong account or a plan adjusted automatically.

Is GMass worth it?

For one person sending a few hundred personal emails a day from Gmail, yes: the 7-day trial needs no card, campaigns run from a Google Sheet and the price is one account. Past two or three accounts the cost moves to Google seats and a separate warmup tool.

The GMass alternatives page prices five options for teams that outgrow Gmail.

Ratings

GMass ratings

Or us

GMass or Outreach2day

Outreach2day is mailboxes, warmup and a sequencer in one subscription, and its mailboxes also work in other sequencers. Where it fits this buyer and where it does not.

GMass

Stay with GMass if

  • You want to keep sending from your own Gmail inbox
  • You need Google Workspace mailboxes
  • You want a free trial before paying

Outreach2day

Outreach2day fits if

  • You run 1,000+ mailboxes: we quote a volume price below every vendor list price in our comparisons, warmup and sending included
  • You are moving past one Gmail account and want mailboxes with warmup included
  • You want a sequencer that runs outside the browser
  • You want one bill instead of GMass plus Google seats plus a warmup tool
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FAQ

GMass review: questions

Is GMass legit?

Yes. GMass is run by GMass, Inc., a Delaware corporation, and works as a Chrome extension inside Gmail. Trustpilot shows 2.9 out of 5 from 40 reviews when we checked.

How much does GMass cost?

$29.95 a month for Standard, $39.95 for Premium and $59.95 for Professional per Gmail account; $20, $29 and $49 a month on yearly billing. Sending through an outside SMTP server adds $5 per 10,000 emails.

Does GMass have warmup?

No. GMass shut its warmup down on January 31, 2023.

How many emails can GMass send a day?

As many as Google allows the account: up to 500 a day from a gmail.com address and 2,000 from Google Workspace. MultiSend spreads one campaign over several accounts.

Does GMass have a free trial?

Yes, 7 days with no card, up to 50 emails a day, without SMTP sending.

Does GMass have an API or MCP server?

A REST API from Premium, with Zapier and webhooks. We found no official MCP server on gmass.co.

Related

More on GMass

Deliverability call

Talk to our deliverability team

Book a call with the people who run our mailbox infrastructure. We look at your current setup and tell you what to change. Running 1,000+ mailboxes? We also quote a volume price below every vendor list price in our comparisons, warmup and sending included.

  • Review your domains, DNS records and current inbox placement
  • Size the setup: domains, mailboxes per domain and daily volume per mailbox
  • Plan warmup and the move from your current provider or sequencer
  • 1,000+ mailboxes: a volume price per mailbox for your setup

Free call

See open times in your time zone and book on this page.

Or open the booking page

Sources

Each vendor's own pages. Vendors change prices and plans; if something here is out of date, write to support@outreach2day.com and we will fix it.

GMass
Outreach2day

Full volume from day 14: 25 cold emails a mailbox a day

Add domains, create mailboxes and turn on warmup. You see every mailbox's warmup numbers from day one.

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Create mailboxes$2.50 a mailbox, all in