Send cold email that
actually gets delivered.
Cluster Blaster is the disciplined bulk-email engine for teams who care about their domain. A slow, controlled drip. Manual batch control. Automatic reply & bounce detection. No spray-and-pray, no burnt reputation — just replies.
- Reputation-first drip
- Manual batch control
- Reply & bounce detection
- SPF · DKIM · DMARC friendly
- Isolated multi-tenant workspaces
Inspired by the efficiency of a beehive.
Just as thousands of bees work together without bottlenecks, Cluster Blaster distributes your email sending across multiple nodes — delivering campaigns at scale with speed, organization and reliability. No single mailbox gets overloaded, no reputation gets burnt, and your infrastructure stays efficient and balanced.
That's the difference. Most tools spray and pray. We built a disciplined engine that treats deliverability as the whole game.
Top-notch customer service
Real humans who actually answer. We obsess over your sending reputation like it's our own — because your results are our reputation.
We are the experts
Deliverability isn't a feature we bolted on. Quiet hours, domain caps, warm-up discipline and IMAP feedback loops are the core of the product.
Best in the market
A distributed, node-based sending model that stays balanced under load — the reliability of a hive, tuned for the inbox.
Built to protect you
Isolated workspaces, automatic suppression, manual batch control. Every safeguard is on by default so one campaign can never sink another.
Everything a careful sender needs.Nothing that gets you blocked.
Every limit is editable, every send is deliberate, and every workspace is walled off from the next.
Disciplined drip
One email per sender per tick — gated by quiet hours, interval, daily limit and domain caps. Reputation stays intact by design.
Manual batch control
Nothing sends until you click "Send next N". Release 20 at a time, swap the template per batch, and resume exactly where you left off.
Reply & bounce detection
IMAP watches every mailbox. Replies and bounces are detected automatically and the contact is suppressed — no more emailing the dead.
True multi-tenant
Each service is its own workspace. Domains, senders, lists and suppression never cross between clients, so one reputation can't sink another.
Smart follow-ups
Queue a second touch to delivered contacts in one click — automatically skipping anyone who already replied or bounced.
CSV import & merge fields
Paste a CSV with auto-detected delimiters. Any extra column becomes a {{merge}} field you can drop straight into templates.
Live in three steps.
Connect a sender
Add your SMTP + IMAP mailbox and set the pace: interval, daily limit, quiet hours and timezone — all editable.
Import & compose
Bring in contacts, build lists, and write templates with merge fields. Everything scoped to one workspace.
Release the drip
Launch a campaign, release batches by hand, and watch replies land while bounces suppress themselves.
The companies already sending with Cluster Blaster.
One flat price. No metering, no surprises.
No one else gives you unlimited emails and unlimited workspaces for a single flat fee. We do.
Billed monthly · cancel anytime · lock in this rate today
- Unlimited emails — no per-message metering
- Unlimited workspaces & senders
- Reputation-first drip engine
- Reply & bounce detection via IMAP
- CSV import, lists & merge fields
- Top-notch human support, always
Start free — pay only when you're ready to scale.
Cold email, without the collateral damage.
Set up your first workspace in minutes. Your domain will thank you.