For multi-tenant platforms

Give every tenant reliable email without managing email infrastructure

Per-tenant reputation, kill switches, and governance — so one bad tenant doesn't ruin everyone's deliverability.

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The multi-tenant email problem

You run a platform. Your tenants send email through your infrastructure. One tenant starts spamming. Your entire sending domain gets blacklisted. Every tenant's email starts bouncing. You get complaints from paying customers.

Truncus gives you per-tenant controls: reputation scoring, automatic throttling, kill switches, and multi-provider failover. One tenant can't take everyone down.

Per-tenant routing in action

Platform API

Truncus

Per-tenant API keys, reputation, governance

Tenant A
SES, normal routing
Tenant B
Postmark (SES throttled)
Tenant C
Kill switch active (high complaints)

Platform-grade controls

Per-account reputation engine

Track bounce/complaint rates per tenant. Auto-throttle bad senders before they damage your domain.

Kill switch

Instantly stop a tenant's email access. One API call. No code changes needed.

Governance modes

Monitor (log only), enforce (apply rules), or block (reject all). Control per tenant.

Recipient cooldowns

Prevent tenants from over-emailing the same address. Configurable per account.

Anomaly detection

If a tenant suddenly sends 10x volume, automatically pause and alert.

Content deduplication

Prevent duplicate sends from tenant integrations. Automatic 10-minute dedup window.

Operations API

Tenants get delivery tracking and lifecycle visibility. You get audit logs.

Multi-provider routing

Route different tenants through different providers. Failover is automatic.

Why platforms choose Truncus

  • One bad tenant can't ruin deliverability for everyone
  • Kill switch means instant response to abuse — no deploys needed
  • Reputation engine auto-throttles before SES suspends your whole account
  • Multi-provider failover keeps email flowing during provider outages
  • Global message ID means full audit trail across retries and failovers
  • EU data residency by default — no GDPR headaches

Pricing

Scale tier for most platforms. Enterprise for custom needs.

Scale

$99/mo

300,000 emails/month

Full governance + multi-provider

Enterprise

Custom

Volume pricing + SLA

Dedicated support

Email execution for your platform

Scale tier: $99/month for 300,000 emails with full governance, reputation engine, and multi-provider failover.

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Truncus for Platforms — Email Execution for Multi-Tenant Platforms