Mailjet Email API
EU-based transactional and marketing email API with real-time sending analytics, template engine, contact management, and strong GDPR compliance story for European applications.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Email API. API key + secret. Sending email at scale — protect from abuse. GDPR contact management. SPF/DKIM/DMARC setup required for deliverability.
⚡ Reliability
Best When
European SaaS products need a GDPR-compliant email API with EU data residency, reasonable pricing, and solid deliverability without the enterprise overhead of AWS SES.
Avoid When
Your primary concern is maximum transactional deliverability at scale — Postmark and SendGrid Pro have deeper infrastructure for high-stakes transactional email.
Use Cases
- • Sending transactional emails (confirmations, notifications, alerts) with real-time delivery tracking
- • Marketing email campaigns with contact list management and segmentation
- • EU-compliant email delivery where data residency and GDPR are primary concerns
- • Inbound email parsing via webhooks for agent-driven email triage workflows
- • Multi-sender transactional email from a single account using sub-accounts
Not For
- • Ultra-high-volume transactional email where deliverability is paramount (Postmark or SendGrid Pro have stronger infrastructure)
- • Teams needing an MCP server or deep AI agent integrations out of the box
- • Complex multi-step marketing automation workflows (ActiveCampaign or Klaviyo are better)
Interface
Authentication
HTTP Basic auth using API Key as username and Secret Key as password. Two-key model (API Key + Secret Key) per account. No granular scope support — each key pair has full account access. Sub-account API keys available for multi-tenant setups. Agent-friendly with no token expiry.
Pricing
Free tier is more generous than SendGrid's 100/day limit. EU company (acquired by Sinch in 2022). Pricing is competitive especially for EU-based companies. No per-seat pricing — volume-based only.
Agent Metadata
Known Gotchas
- ⚠ Two-credential auth (API Key + Secret Key) differs from typical single-key API patterns — pass both as HTTP Basic auth, not as header values
- ⚠ Domain and sender validation required — new sender addresses need verification before sending, which can delay first-time agent deployments
- ⚠ No idempotency keys — retrying a failed send creates duplicate emails; agents need external dedup state
- ⚠ Event Webhook payloads are arrays of events — handlers must process batch payloads, not single-event objects
- ⚠ Contact management API and transactional send API have separate endpoint bases (v3/REST vs v3.1/send) — easy to mix up
- ⚠ Inbound email parsing requires MX record configuration — not self-service; involves DNS setup
- ⚠ Free tier rate limits lower than paid tiers — test at realistic volumes before production deployment
Alternatives
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Scores are editorial opinions as of 2026-03-07.