EU Transactional Email API — Operated Under EU Law
A transactional email API operated by Infotech Pioneers Oy — a Finnish company subject to EU law and outside US CLOUD Act jurisdiction. REST, signed webhooks, pre-signed Article 28 DPA. Sandbox key ready on signup, 1,000 free sends.
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Quick Answer
An EU transactional email API sends one-to-one, event-triggered emails (password resets, order confirmations, alerts) from infrastructure operated under EU jurisdiction — important for organisations whose Data Protection Impact Assessment must answer the Schrems II question. NexusProMail is operated by Infotech Pioneers Oy, a Finnish company subject to EU law, with a pre-signed Article 28 DPA, signed-HMAC webhooks and suppression-list enforcement at the API layer. Sandbox API key issued on signup; 1,000 free sends with no credit card.
Key Takeaways
- Transactional emails are triggered by user actions; marketing emails are sender-initiated — different consent rules apply
- Always send from a dedicated subdomain (e.g. mail.yourdomain.com) separate from your marketing sending domain
- Register webhook endpoints to receive real-time events for bounces, complaints, opens and unsubscribes
- The sandbox API key works immediately on signup — no DNS setup required for initial testing
- The API enforces suppression automatically — attempting to send to a suppressed address returns a 422 response
Why EU Companies Choose This Transactional API
The transactional API feature set is roughly comparable across all major ESPs. The differences that matter for EU teams are jurisdictional.
Operator under EU law
Infotech Pioneers Oy is a Finnish company subject to EU regulation. The operator’s jurisdiction — not just the data centre — is what GDPR Article 44 and your DPIA care about.
Pre-signed Article 28 DPA
Every paid plan includes a pre-signed Data Processing Agreement referencing Article 28 obligations, our current sub-processors and an EU jurisdiction clause. No legal back-and-forth.
Schrems II compatible
No third-country transfer in the processing chain — the Standard Contractual Clauses + Transfer Impact Assessment workflow does not apply. Cleaner DPIA for buyer-side legal review.
EU data residency roadmap
Current AWS region: us-east-1. Migration to eu-west-1 (Ireland) is planned for Q3 2026. All processing today is governed by Finnish law regardless of where it physically runs.
CLOUD Act outside scope
A Finnish company is not subject to US legal compulsion frameworks (CLOUD Act, FISA 702). For sectors that must document this exposure in procurement, this is a meaningful distinction.
Sub-processor transparency
Current sub-processor list is published and the DPA carries change-notice clauses. You see what we change and you can object before it takes effect.
Comparing options? SendGrid EU alternative · Mailgun EU alternative · Resend EU alternative
Send your first email in under 5 minutes
Sign up, copy your sandbox key and make your first API call. The sandbox environment mirrors production — when you go live, only the key changes.
- ✓Sandbox key available immediately on signup
- ✓No DNS setup required for initial testing
- ✓Production key activates after domain verification
- ✓Same endpoints for sandbox and production
Core API Endpoints
Everything Included With the API
Sandbox key on signup
Test in a fully isolated sandbox environment. No DNS changes needed. Switch to production with one key rotation.
Webhooks for every event
Receive signed webhook calls for sent, delivered, opened, clicked, bounced and complained. Register up to 10 endpoints per account.
Suppression enforcement
The API checks your suppression list before every send. Unsubscribed and hard-bounced addresses are rejected at the API level, not just filtered.
Per-send analytics
Query open rates, click rates and bounce rates per message ID via the analytics API. No dashboard login required.
GDPR-compliant by default
GDPR-focused infrastructure operated under EU law. Suppression enforced. DSAR (erasure) endpoint included. DPA available on request.
Rate limiting by plan
API calls are rate-limited to match your plan's send quota. The usage endpoint lets you check remaining sends programmatically.
API Questions Answered
What is a transactional email API?
How do I get started with the NexusProMail API?
What languages does NexusProMail support?
Does the API support webhooks?
What is the difference between transactional and marketing email in NexusProMail?
Is the API GDPR-compliant?
Start with 1,000 free sends
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Also read: API integration guide · Email deliverability · Domain warming · GDPR compliance