GMass

What is GMass?

GMass is a Chrome extension that transforms your Gmail into a full email marketing and cold email platform. Instead of juggling CSV imports, separate ESPs, or complicated interfaces, you just hit Compose in Gmail, enter your list, subject, and message, and GMass sends individually personalized emails using mail merge powered live by Google Sheets. It handles automatic follow-up sequences, behavior-based campaigns, and free email list verification—all inside Gmail.

Who is it for?

GMass is built for salespeople running cold outreach, recruiters sending bulk personalized emails, and small businesses that need campaign management without a dedicated ESP. It’s trusted by 300,000+ users and backed by 5-star reviews. If you want a separate marketing dashboard or need drag-and-drop email builders, GMass is not for you—it works strictly inside Gmail with a minimal learning curve.

Real use cases

Common uses include sending personalized mass emails to prospects from a Google Sheet, setting up automated follow-up sequences that stop when someone replies, and re-targeting segments of past campaigns (like everyone who opened but didn’t click). GMass also breaks Gmail’s daily sending limits using its distribution technology, making it viable for volume senders.

• Mail Merge with Google Sheets — Personalize live from any spreadsheet column, with auto-detected fallback values
• Automatic Follow-Ups — Send sequences until a recipient replies to boost response rates
• Email List Builder — Find addresses buried in your Gmail just by searching
• Behavior-Based Campaigns — Re-target segments like openers or non-clickers from past sends
• Reply Management — Auto-categorize replies and bounces to keep your inbox clean
• Campaign Reporting — Track opens, clicks, replies, and bounces inside Gmail
• Unlimited Email Volume — Break Gmail’s daily limits with distribution technology