Build on the
NexusProMail API
Send transactional emails, manage contacts, automate campaigns and track analytics — all via a simple REST API.
API Reference
All endpoints require your API key in the Authorization header.
Authorization: Bearer YOUR_API_KEYCode Examples
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Documentation & Guides
The full developer surface. Everything you need to integrate, debug and scale.
Transactional Email API →
REST API reference for send, batch send, scheduled send, contacts, lists, webhooks.
EU Email API →
The EU-jurisdiction story: operator under Finnish law, signed DPA, no US transfer chain.
API Integration Guide →
End-to-end integration walkthrough: authentication, idempotency, webhooks, error patterns.
API Pricing →
Plan structure, contact + send-volume tiers, worked examples by use case.
Email Deliverability →
SPF/DKIM/DMARC setup, sender reputation, bounce handling, the inbox-vs-spam picture.
Domain Warming →
Week-by-week schedule for warming a new sending domain. Safety thresholds.
SMTP vs REST →
Why NexusProMail exposes REST (not SMTP) and how to migrate from SMTP-based stacks.
Webhook events →
Event types (delivered, opened, clicked, bounced, complained, unsubscribed). HMAC verification.
Multi-brand sending →
Sub-account isolation. Per-brand suppression. Per-brand DKIM keys. Multi-tenant patterns.
GDPR for developers →
DPA, DSAR API, consent records, suppression enforcement. The compliance picture from the API side.
Schrems II / EU jurisdiction →
The Schrems II story at the processor level. EU controller-processor relationship.
DPA — Data Processing Agreement →
Pre-signed Article 28 DPA covering NexusProMail processing on behalf of customers.
Pre-built Integration Guides
For the most common integration patterns. Each guide includes setup steps, webhook mapping and example workflows.
Developer FAQ
How do I get an API key?
Is the API REST or SMTP?
What authentication does the API use?
How do webhooks work?
Is there rate limiting?
What SDKs are available?
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