GMass
Send mail-merge and cold email campaigns directly from inside Gmail.
What is GMass?
GMass is a Gmail extension for sending mass email, mail merge, and cold outreach campaigns without leaving the inbox. It layers personalization, tracking, automated follow-ups, and list management on top of a regular Gmail or Google Workspace account.
Best known for: Sending cold email and mail merge from inside Gmail
Key features
- Mail merge with personalization from Google Sheets
- Automated follow-up sequences
- Open, click, and reply tracking
- Free built-in email verification
- Inbox rotation for improved deliverability
- Scheduling and A/B testing
Who GMass is best for
- Solopreneurs and small teams doing cold outreach
- Gmail-based users who want to avoid separate ESP tools
- Recruiters and sales reps sending personalized mass email
Ideal team: Solo operators and small sales or outreach teams that run everything inside Gmail.
GMass pricing
Standard
$29.95/per user / mo
- Unlimited emails and contacts
- Mail merge personalization
- Open and click tracking
Premium
$39.95/per user / mo
- Everything in Standard
- Automated follow-up sequences
- Triggered and behavior-based emails
Professional
$59.95/per user / mo
- Everything in Premium
- Inbox rotation for deliverability
- High-priority support
Costs to watch before you commit
- Advertised low prices ($20/$29/$49) require annual prepay; month-to-month billing costs more
- Free email verification and inbox rotation are gated to higher tiers
- Priced per user, so team costs scale quickly as seats are added
GMass pros and cons
Pros
- Lives inside Gmail, so there's no new interface to learn and campaigns send from the address people already reply to
- Sends from your real mailbox, which typically lands better than a bulk ESP's shared sending infrastructure
- Unlimited emails and contacts on every tier: no list-size pricing, which is unusual and genuinely valuable
- Mail merge personalization and reply detection work well, and follow-ups stop automatically when someone responds
- Automated sequences on Premium turn one-off sends into proper multi-touch outreach
- Inbox rotation on Professional spreads volume across mailboxes, which is the single most effective deliverability lever at scale
Cons
- Advertised rates ($20/$29/$49) require annual prepayment; month-to-month is $29.95/$39.95/$59.95
- Priced per user, so a small outreach team multiplies the cost quickly
- Constrained by Gmail's own sending limits (roughly 500/day on a consumer account, 2,000 on Workspace) regardless of what you pay
- Email verification and inbox rotation are gated to higher tiers, so serious cold outreach effectively starts at Professional
- Not a marketing-automation platform: no landing pages, forms, or visual journey builder
- Cold outreach carries real compliance obligations under CAN-SPAM, GDPR, and PECR that the tool won't handle for you
GMass review: a closer look
What GMass is
GMass is a Gmail extension that turns your inbox into a mail-merge and cold-outreach tool. You compose in Gmail, pull recipients from a Google Sheet or a search of your own mail, personalize with merge fields, and send: with tracking, follow-ups, and reply detection layered on. The architectural choice that defines it is that mail goes out through your actual mailbox rather than a bulk provider's servers. That's the whole pitch: your outreach looks and behaves like email from a person, because it is.
Why sending from your own mailbox matters
Deliverability is the entire game in cold outreach, and it's where GMass's approach pays off. Mail sent through a bulk ESP travels over shared infrastructure whose reputation you don't control and arrives with the telltale signatures receiving servers use to sort promotional mail away from the inbox. Sending through your own Google account inherits your domain's reputation and looks like ordinary correspondence. Replies land in your normal inbox and the thread stays intact, which sounds trivial and matters enormously when a prospect answers three weeks later. The trade is that you inherit Gmail's limits too (around 500 recipients a day on a consumer account and 2,000 on Workspace) and no subscription tier lifts them, because they aren't GMass's to lift.
Tiers, and where cold outreach actually starts
Standard at $29.95/user/mo covers unlimited emails and contacts, mail merge, and open and click tracking. Premium at $39.95 adds automated follow-up sequences and behavior-triggered sends: for most people doing genuine outreach rather than one-off announcements, this is the real entry point, because sequences are where response rates come from. Professional at $59.95 adds inbox rotation and priority support. The advertised $20/$29/$49 figures assume annual prepayment, so budget the monthly numbers unless you're committing for a year. Note the shape of the gating: email verification and inbox rotation, the two features that most protect your domain reputation, sit on the higher tiers, so anyone sending at real volume should price Professional rather than assuming Standard will do.
The compliance part nobody enjoys
GMass makes sending cold email easy; it does not make it lawful. Under CAN-SPAM in the US you need accurate headers, a physical postal address, and a working unsubscribe honored promptly. Under GDPR and PECR in Europe and the UK the bar is considerably higher; you generally need a lawful basis for contacting someone, and B2B cold email that ignores this is a genuine liability rather than a theoretical one. The tool gives you unsubscribe handling and list management; the legal position is yours. Also worth saying plainly: unlimited sending plus your own domain reputation is a combination that punishes carelessness. A badly-targeted blast doesn't just perform poorly, it can damage the deliverability of your ordinary business email for months.
How it compares
Against dedicated cold-outreach platforms like Instantly or lemlist, GMass is simpler and cheaper but shallower; those offer multi-inbox orchestration, warmup, and campaign analytics built for teams running outreach as a function. Against Mailchimp, Brevo, or Kit, it isn't really the same product: those are marketing platforms with lists, landing pages, and automations for people who opted in, whereas GMass is built for one-to-one-shaped mail sent at scale to people who didn't. Against Woodpecker, the comparison is closest (similar philosophy, similar deliverability focus) with GMass's advantage being that it lives in Gmail rather than beside it. If your outreach is small-team, Gmail-native, and reply-driven, GMass fits; if it's a coordinated multi-mailbox operation, the specialists fit better.
Who should use GMass?
A good fit
GMass fits solopreneurs, recruiters, sales reps, and small teams who already run their day in Gmail and want personalized outreach at moderate volume without adopting a separate platform. It's particularly good where replies matter more than open rates (recruiting, partnerships, founder-led sales, journalist and link outreach) because the conversation continues in a normal Gmail thread. The unlimited-contacts pricing also makes it attractive to anyone with a large list who'd be penalized by per-contact billing elsewhere.
Look elsewhere if…
Teams running outreach as a coordinated function across many mailboxes will get more from Instantly, lemlist, or another dedicated platform with warmup and multi-inbox orchestration. Anyone who needs landing pages, signup forms, or visual automation journeys wants a marketing platform instead, GMass does none of that. Businesses needing to exceed Gmail's daily send limits won't get there by upgrading tiers, and organizations without a clear lawful basis for cold contact in the EU or UK should resolve that before buying any outreach tool.
The verdict
GMass is an unusually well-judged tool for a specific job: personalized email at scale, sent from your own mailbox, without leaving Gmail. Unlimited emails and contacts at every tier is a genuinely generous pricing model, reply detection and sequences are well implemented, and the deliverability advantage of sending as yourself is real rather than marketing copy. The constraints are honest ones: Gmail's send limits cap you regardless of spend, per-user pricing bites as teams grow, the annual-prepay discount makes the headline misleading, and the features that protect your domain reputation sit on the top tier. Price Premium or Professional rather than Standard if you're doing this seriously, and sort out your compliance position before your first send, not after.
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