Gmass

Gmass

GMass is a Gmail-based email marketing and cold outreach platform delivered primarily via a Chrome extension that enables mail merges with Google Sheets, automated follow-ups, deliverability tools, and integrations (SMTP, API, webhooks, Zapier) for professional email campaigns.

Gmass is marketing software teams evaluate for marketing. Use this page to review pricing, integration signals, and the best alternatives before you commit.

Contact for pricing API 70/100
#72 in Marketing (72 tools)
Added 5 months ago
Data reviewed Jul 16, 2026

Quick Overview

Best for: Marketing

What it does

Marketing software for decision-makers comparing workflow fit and alternatives.

Best fit

Marketing

Pricing snapshot

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Gmass

GMass turns Gmail into an email marketing and cold-email platform via a Chrome extension and complementary services. It is built for marketers, sales teams, recruiters, organizations and anyone who needs to send personalized mass emails from Gmail, supporting mail merge personalization with Google Sheets, automated follow-ups, campaign analytics, deliverability tooling, and SMTP/REST API integrations.

GMass combines a Chrome extension (Add to Gmail) with a suite of deliverability and verification tools (Email Verifier, Email Tester, SMTP Tester), an SMTP service, and APIs/webhooks to enable professional-grade mass emailing while monitoring opens, clicks, replies, bounces, and other campaign metrics.

GMass is a Gmail-based email marketing and cold outreach platform delivered primarily via a Chrome extension that enables mail merges with Google Sheets, automated follow-ups, deliverability tools, and integrations (SMTP, API, webhooks, Zapier) for professional email campaigns.

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Key Features

Mail Merge with Google Sheets

Read merge fields live from Google Sheets and auto-send emails to new rows; supports personalization with any sheet column and fallback values.

Automatic Follow-up Emails

Configure sequences of automatic follow-ups that continue until a recipient replies; supports unlimited auto follow-up stages.

Deliverability & Testing Tools

Email Tester checks SPF, DKIM, DMARC, blacklistings; Real-time SPF checks and tools to monitor where emails land (Inbox, Spam, Promotions).

SMTP Integration & SMTP Service

Use third-party SMTP servers or GMass's ColdSMTP sending server to exceed Gmail's native sending limits; add multiple SMTP servers and select which to use.

Campaign Analytics & Reporting

Campaign-level reports showing opens, clicks, replies and bounces with sharable reports and domain statistics.

Reply & Unsubscribe Management

Automatic categorization of replies and bounces to prevent inbox clutter, plus unsubscribe management across teams.

AI Features

AI-powered features include SpinMax automatic spintax, AI template builder for HTML layouts, Spam Solver suggestions, and ChatGPT campaign writing.

Behavioral & Segmented Campaigns

Send to segments based on prior campaign behavior (opens, clicks) and send campaigns as replies or to segments of previous campaigns.

Templates & AB Testing

Create and manage templates saved from sent emails and run A/B tests with automatic winner deployment.

Automation & Scheduling

Schedule mail merges for future times, repeat sends, set daily end times, and monitor sending speed in real time.

Integrations & API

REST API, webhooks and Zapier support to connect external apps to GMass.

Pricing

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Use Cases

Cold Email Outreach

Send and automate cold email sequences from Gmail to drive sales and recruit leads.

Marketing Newsletters & Announcements

Deliver personalized mass newsletters and announcements from a Gmail account with analytics and deliverability tools.

Membership & Community Outreach

Keep members informed, manage membership outreach, and handle event or membership communications.

Press & Media Outreach

Manage press release campaigns and media outreach with templates, tracking, and follow-ups.

Transactional & Confirmation Emails

Send transactional emails (confirmations, receipts) through Gmail or via integrated SMTP/ColdSMTP service.

Internal Communications

Send mass emails to teams or organizations such as schools, churches, HOAs, sports clubs, and more.

Link Building & SEO Outreach

Scale backlink outreach and link-building campaigns with personalization and follow-ups.

Integrations

Google Sheets

Live mail-merge data source; GMass reads columns and can monitor new rows to auto-send emails.

SMTP providers / ColdSMTP

Use third-party SMTP servers or GMass’s ColdSMTP sending server to send large volumes and bypass Gmail limits.

REST API, Webhooks, Zapier

Programmatic integrations to connect external apps and automate workflows with GMass.

Gmail

Works inside Gmail via a Chrome extension to send campaigns from a Gmail account.

Benefits

Personalize mass emails at scale using Google Sheets data and mail merge fields.
Improve deliverability with testing tools, SPF/DKIM/DMARC checks, and a dedicated SMTP service.
Automate follow-ups and sequences to increase response rates without manual work.
Monitor campaign performance in real time with analytics for opens, clicks, replies and bounces.
Break Gmail's native sending limits using distribution technology and SMTP options.

Limitations

Requires Chrome to use the GMass Chrome extension ('GMass requires Chrome').
Operates by sending from Gmail accounts (dependent on Gmail), so Gmail account policies and limits are relevant to usage.

Frequently Asked Questions

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Getting Started

  1. 1 Step 1: Install the GMass Chrome extension (Add to Gmail) — GMass requires Chrome.
  2. 2 Step 2: Connect a Google Sheet or prepare your recipient list (or build a list from Gmail searches).
  3. 3 Step 3: Compose your message in Gmail, configure mail merge fields, scheduling, and follow-ups, then send or schedule the campaign.

Support

Docs & Help Center

Support resources and documentation accessible from the GMass website (Support / Get support links).

Reviews & Community

User reviews and community feedback available via the Reviews tab on the site.

API

Available: Yes

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