Email Delivery Control Plane
Your product email shouldn’t depend on a black box.
Sendarix is the control plane for multi-tenant SaaS email. Route by tenant, domain, message type and live relay health. Isolate blast radius. Recover from deliverability incidents before your users notice — on infrastructure Sendarix operates end to end.
No credit card · Drop-in SMTP & API · Sendarix-managed delivery infrastructure
Representative product UI — illustrative data, not live customer metrics.
The multi-tenant problem
One tenant can break email for everyone.
In a shared sending setup, a single abusive tenant, misconfigured domain, or relay incident can damage reputation across your entire customer base. Black-box senders show you the symptoms — not the controls to contain them.
Shared reputation pool
no control planeOne abusive tenant poisons the pool — every customer degrades.
Isolated with Sendarix
blast radius containedThe bad tenant is quarantined to its own pool — everyone else stays healthy.
Built-in delivery, not a passthrough
Sendarix runs the delivery layer.
Messages leave through Sendarix-operated relay pools and IP infrastructure — not a third-party ESP hidden behind your API. Define how every message is routed, isolated, monitored and recovered inside one control plane you operate.
Representative product UI — illustrative data, not live customer metrics.
The control loop
Route. Isolate. Monitor. Recover.
Four operations form a continuous control loop around your most critical email.
Route by policy
Send every message through the right relay pool, IP set and stream based on tenant, domain, message type and live path health.
02 / ISOLATEIsolate blast radius
Wall off tenants, domains and traffic classes so one bad sender can never contaminate everyone else’s reputation.
03 / MONITORMonitor everything
See every send, deferral, bounce and complaint in a live event timeline — deliverability becomes observable, not mysterious.
04 / RECOVERRecover automatically
Detect degradation and reroute critical streams to healthy relay paths before a deferral turns into a support ticket.
Inside the control plane
This is the operator view.
The same dark operator console your team works in every day — routing rules, tenant isolation, live events and relay health in one place.
Representative product UI — illustrative data, not live customer metrics.
| Tenant | Pool | Signal | Status |
|---|---|---|---|
| acme-corp | dedicated-ip-12 | Clean sends | healthy |
| northwind | shared-eu-3 | Stable | healthy |
| tenant_8842 | quarantine-1 | Complaints rising | isolated |
| globex | shared-us-1 | Stable | healthy |
Representative product UI — illustrative data, not live customer metrics.
Representative product UI — illustrative data, not live customer metrics.
| Relay path | Signal | Status |
|---|---|---|
| EU transactional | Stable delivery | healthy |
| US bulk | Low deferrals | healthy |
| Dedicated tenant | Elevated deferrals | degraded |
Representative product UI — illustrative data, not live customer metrics.
Representative product UI — illustrative data, not live customer metrics.
Operator views below use representative UI with illustrative data — not live customer metrics.
An incident, narrated
A relay path degrades. Your users never notice.
At 03:14 the EU transactional pool starts throttling OTPs. Sendarix detects the deferral, reroutes the stream to a healthy US relay, and delivery recovers automatically — no engineer paged, no firefighting.
Representative product UI — illustrative data, not live customer metrics.
# Send a critical email through a routing policy curl -sS -X POST 'https://app.sendarix.com/v1/email/send' \ -H 'Content-Type: application/json' \ -H 'X-API-Key: YOUR_API_KEY' \ -H 'Idempotency-Key: otp_8842' \ -d '{"to":"user@acme.com","template":"password_reset","routing_policy":"transactional-critical"}'
const sendarix = require("sendarix")(process.env.SENDARIX_KEY); await sendarix.email.send({ to: "user@acme.com", template: "password_reset", routingPolicy: "transactional-critical", idempotencyKey: "otp_8842" });
# Drop-in SMTP — keep your integration, gain a control plane host: smtp.sendarix.com port: 587 (STARTTLS) username: "your_sending_key" header: X-Sendarix-Policy: transactional-critical
Built for engineers
Ship in one request. Keep your SMTP.
Drop-in SMTP and a REST API with idempotency keys and routing policies as first-class fields. Migrate one critical stream first — leave everything else where it is.
Built for the way you send
Infrastructure for teams whose email is the product.
Multi-tenant SaaS
Protect every customer’s email with per-tenant routing and isolation.
Explore →Marketplaces
Segment seller and buyer risk so abuse never poisons shared reputation.
Explore →Transactional email
Keep OTPs, password resets and billing alerts on a protected critical path.
Explore →Deliverability recovery
Diagnose spam placement and throttling, then reroute and warm back up.
Explore →High-volume senders
Scale volume across pools without reputation collapse.
Explore →Enterprise platforms
Dedicated pools, governance and migration help for regulated, high-stakes senders.
Explore →Why switch
Own the delivery layer. Operate it like infrastructure.
Sendarix combines a control plane with the relay infrastructure behind it — policy-first routing, multi-tenant isolation, and automatic recovery you can actually operate.
Built like infrastructure
Isolation, signing and governance by default.
Security headers, signed webhooks, SSO, DPA and tenant isolation are part of the architecture — not an upsell.
Capabilities listed above reflect platform design — not live system status or third-party certifications.
Pricing
Priced by the control you need.
Start free and grow into routing, isolation and governance as your infrastructure matures — not just by email volume.
Free
Test the integration
Starter
Production transactional
Professional
Routing + failover
Business
Tenant isolation + SSO
Enterprise
Dedicated infra + SLA
Protect critical email across every tenant.
Move your most critical stream to Sendarix this week. Keep everything else exactly where it is.
