Most SaaS companies run their entire email infrastructure on a single provider. When that provider has an outage — and they all do — every password reset, order confirmation, and onboarding email fails silently.
Your users don't see an error message. They just don't get the email. And they blame your product.
The Real Cost of Email Downtime
- Password resets fail → users can't log in → support tickets spike
- Onboarding emails don't arrive → new users drop off → lost revenue
- Order confirmations disappear → customers contact support → trust erodes
- Payment notifications fail → chargebacks increase
For a SaaS with 1,000 users, even a 30-minute email outage during peak hours can cost hundreds in lost conversions and support costs.
Why Single-Provider Email is a Risk
Most email APIs are wrappers around one infrastructure:
- Some email APIs are wrappers around larger cloud providers — if the underlying provider fails, the wrapper fails with it
- Others run on a single email infrastructure, meaning one failure takes down everything
- There's no built-in fallback, no retry across providers — your emails just stop
If that one provider goes down, you go down with it. No fallback. No retry. Your emails just stop.
What Multi-Provider Email Looks Like
The solution isn't complex. It's controlled redundancy:
Your App → Email API → Primary Provider (SES) → Backup Provider (EU) ← automatic failover → Retry Queue ← nothing gets lost
When the primary provider fails:
- Circuit breaker detects the failure (5 failures in 60 seconds)
- Traffic automatically routes to the backup provider
- Any emails that couldn't be sent enter a durable retry queue
- When the primary recovers, traffic routes back automatically
Your users never notice. Your emails keep sending.
The EU Advantage
If you're a European company, there's an additional dimension: data residency. Most email providers process data in the US. With multi-provider architecture, you can route through EU-based infrastructure (Ireland + France) and maintain GDPR compliance by default.
How We Built This
At Truncus, we built an email execution layer that routes through multiple providers automatically. SES as primary (Ireland), Brevo as EU backup (France). Circuit breaker, durable retry queue, dead-letter recovery. Every email logs which provider sent it.
The architecture:
Truncus API → Provider Router → SES (Ireland, primary) → Brevo (France, EU backup) → Failed? → Retry Queue → 5 retries exhausted? → Dead Letter → Manual replay available
No email gets lost. Ever.
If you're building a SaaS that depends on transactional email, consider what happens when your provider goes down. Single-provider is a single point of failure.
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