Mailjet V2

Mailjet is a European email service provider with strong GDPR compliance focus — good choice for companies prioritizing EU data residency and GDPR-compliant email operations. For agents: transactional send via Send API v3.1, template-based sends with variable substitution, contact list management for marketing, and real-time delivery event tracking via webhooks. Free tier (6,000 emails/month, 200/day) is competitive. Confidence is docs-derived.

REST API at api.mailjet.com/v3.1. Send: POST /v3.1/send sends email ({Messages: [{From: {Email, Name}, To: [{Email}], Subject, TextPart, HTMLPart}]}). Template send: POST /v3.1/send ({Messages: [{TemplateID: 123, TemplateLanguage: true, Variables: {name: "Alice"}}]}). Contacts: POST /v3/REST/contact creates contact ({Email, Name}). POST /v3/REST/contactslist creates contact list. POST /v3/REST/contactslist/{id}/managecontact adds contact to list. Campaigns: POST /v3/REST/campaign creates campaign. GET /v3/REST/messagesentstatistics/{msgId} retrieves send statistics. Event webhooks: configure in Dashboard for delivery, bounce, click, open events. Templates: managed via Mailjet Dashboard or POST /v3/REST/template via API.

Basic auth: Authorization: Basic base64(api_key:api_secret). Credentials from Mailjet → Account → API Keys. HTTPS enforced. No OAuth2. EU data residency: Mailjet stores data in EU (Mailgun EU region equivalent). Webhook auth: Mailjet signs payloads via X-Mailjet-Signature for HMAC-SHA256 verification (v3.1 webhooks). Sender authentication: SPF and DKIM required for production sending — configure DNS records.

Standard HTTP status codes with JSON error bodies ({ErrorInfo, ErrorMessage, StatusCode}). 400 for invalid email format. Bounce handling: Mailjet maintains bounce list — sending to bounced address returns error. Rate limiting: 200 requests/minute standard. Bulk send: Messages array up to 50 per request in v3.1. Send API v3.1 vs. v3: different base paths (/v3.1/send vs. /v3/send) — new integrations should use v3.1. Mailjet uptime at status.mailjet.com. Template language: Mailjet templating uses {{var:variable_name}} syntax — different from Handlebars and Mustache.

dev.mailjet.com covers REST API reference (v3.1), SDK guides, webhook documentation, template language reference, and contact management docs. Getting started: create Mailjet account (free tier), get API keys — first email in under 5 minutes. Official SDKs: mailjet-apiv3-python, mailjet-apiv3-nodejs, mailjet-apiv3-php, mailjet-apiv3-java, Mailjet.Api (.NET), mailjet-gem (Ruby), mailjet-go. Community via Mailjet support and developer documentation. Solid documentation for a focused email platform.