Zen SMTP
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Lightweight SMTP filtering layer for modern mail stacks

Spam filtering that feels… calm.

Zen SMTP sits in front of your mail infrastructure to block spam, reduce abuse, and protect deliverability— with minimal setup and a clean, modern dashboard.

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Low-friction setup
Fast filtering pipeline
Deliverability focused

Bright, simple protection

Zen SMTP focuses on the essentials: block obvious junk, reduce graymail, and keep your domains in good standing. No noisy complexity.

SMTP proxy layer

Drop in front of your existing MX / inbound flow and start filtering without re-architecting.

Policy-based controls

Whitelist/allow, quarantine, or block with straightforward rules that match how teams actually work.

Clear visibility

See what’s being stopped (and why) without drowning in metrics you’ll never use.

How it works

A calm three-step flow: route in, filter, deliver. That’s it.

1
Point inbound mail to Zen SMTP Update your routing/MX to place Zen SMTP in front of your existing mail server.
2
Filter spam + abuse Zen SMTP evaluates messages and applies your policy: allow, quarantine, or block.
3
Forward clean mail to you Legitimate messages continue on to your infrastructure with minimal latency.

Made for a light footprint

Keep the product surface simple: set a policy, confirm routing, monitor outcomes.

Setup
Minutes, not days
Focus
Deliverability-first
Noise
Kept to a minimum

Plans

Keep it simple. Start small, scale as you grow.

Zen SMTP for teams

Flexible plans for inbound protection across domains and mailboxes.

  • Quarantine + allow/block policy
  • Domain-level routing support
  • Clean, minimal dashboard
  • Email support & onboarding help

Talk to us

Want a quick walkthrough or early access?

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Or visit: zensmtp.com
Ready for calmer inboxes?
Drop Zen SMTP in front of your mail flow and reduce spam noise fast.
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