Compare: Email Marketing Campaigns in Gmail: Gumbamail vs GMass: Powerful mail merge for Gmail

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Metric	Email Marketing Campaigns in Gmail: Gumbamail	GMass: Powerful mail merge for Gmail
User count	5,000	400,000
Average rating	3.62	4.78
Rating count	79	9,154
Last updated	2026-06-17	2026-06-30
Size	1.24 MB	0.30 MB
Version	1.9.4	6.0.43

Short description	Send mass email marketing campaigns and newsletters directly from Gmail with Gumbamail. Schedule, design, and manage mailings easily, without limits.	GMass transforms Gmail into a powerful mass email and mail merge platform with personalized campaigns, follow-ups, and superior deliverability.
Full summary	Gumbamail is a Chrome extension that empowers you to run professional email marketing campaigns directly within Gmail. Ideal for sales professionals, small businesses, and freelancers, it simplifies creating, scheduling, and sending mass emails without ever leaving your inbox. With over 100 customizable, responsive templates and seamless integration with Google Sheets and Gmail contact groups, managing mailing lists has never been easier. Unlike other services, Gumbamail imposes no sending limits thanks to its own backend system, allowing you to send as many emails as you need. The extension offers a 100% free account with up to 250 emails per month and flexible plans for larger needs. If you're looking to boost productivity and streamline your email marketing efforts directly from Gmail, Gumbamail is the perfect tool.	GMass is a robust Chrome extension that turns Gmail into an advanced platform for cold outreach, email marketing, and mail merges. With features like personalized mail merges using Google Sheets data, inbox rotation for sending campaigns across multiple accounts, and high deliverability rates, it helps users send thousands of customized emails efficiently. GMass includes automation options such as triggered emails, auto follow-ups, and recurring campaigns, enhanced by integrations with CRM platforms and Zapier. Safety and spam management are core strengths, with built-in spam testing, free email verification, DKIM support, and bounce/unsubscribe handling. Users benefit from sophisticated campaign tracking—monitoring opens, clicks, replies, and bounces in real-time. Additional utilities include A/B testing, scheduling, email personalization with images and attachments, spintax, countdown timers, quick polls, and seamless compatibility with Grammarly for flawless emails. Used by nearly 400,000 users with a 4.8-star average rating, GMass offers a comprehensive email marketing solution directly within Gmail without needing an external portal.