If you're building a SaaS in Europe, your email infrastructure probably processes data in the US. Most email API providers are American companies with US-based infrastructure.
That's a problem for GDPR compliance, data residency requirements, and increasingly, for your customers who care about where their data goes.
The Data Residency Gap
Most popular email APIs process your data in the US:
- The majority of email API providers are headquartered in the US with US-based infrastructure
- Some offer EU regions as an option, but failover and backup paths often route through US servers
- Even "wrapper" APIs that use EU-capable underlying providers don't guarantee EU-only processing by default
If you're sending password resets, onboarding emails, or payment notifications, the email content and recipient data passes through these systems. Under GDPR, that's personal data processing — and it matters where it happens.
What EU-First Email Infrastructure Looks Like
True EU email infrastructure means:
- Primary sending from EU servers — not US servers with an EU "option"
- Backup infrastructure also in EU — if failover sends data to US servers, you've lost the benefit
- No transatlantic data transfer for core operations — the email content and metadata stays in Europe
The architecture:
Your EU App → Email API → SES eu-west-1 (Ireland, primary) → Brevo (France, EU backup) → Both providers: EU data processing
Beyond Compliance: Performance
EU-based infrastructure isn't just about compliance. It's also faster for EU recipients:
- Lower latency to EU mailboxes (Gmail, Outlook EU servers)
- DKIM signing from EU IP ranges (better reputation with EU ISPs)
- Reduced round-trip time for delivery confirmation
Multi-Provider + EU = Real Reliability
The strongest position combines both:
- Multi-provider failover — if one provider goes down, the other takes over
- Both providers in EU — failover doesn't compromise data residency
- Durable retry queue — nothing gets lost during transitions
This is what we built at Truncus. SES in Ireland as primary. Brevo in France as EU backup. Automatic circuit breaker. Durable retry queue with dead-letter recovery. EU data residency on both paths.
If you're a European SaaS company, your email infrastructure should be European too.
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