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.

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 fail-fast circuit breakers. One tenant can't take everyone down.

Per-tenant routing in action

Platform API

Truncus

Per-tenant API keys, reputation, governance

Tenant A

SES Ireland, sending normally

Tenant B

Circuit open — fail-fast with exact error

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.

EU-resident sending

AWS SES in Ireland (eu-west-1). Circuit breakers detect failures fast and surface the exact error — no silent failures for any tenant.

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
Fail-fast circuit breakers (AWS SES, Ireland) — failures surface as a precise error, never silently
Durable retry queue with exponential backoff — zero email loss
Every send logged with its outcome — full audit trail
EU data residency by default — sending from Ireland, data in Frankfurt, GDPR-native

Pricing

Scale tier for most platforms. Enterprise for custom needs.

Scale

$99/mo

300,000 emails/month

Full governance + reputation engine

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 EU-resident sending.

Start with Scale