apio

Use cases · Email APIs

Best Email APIs for Marketing & Broadcasts

APIs that send bulk marketing campaigns and broadcasts alongside (or instead of) transactional mail.

Required capability: Marketing / broadcasts.

Our pick: Mailjet

Mailjet is an email platform for transactional and marketing email, built for developers and marketers, with EU data residency in Frankfurt and Belgium. The REST API uses basic auth, webhooks, seven SDKs, and an official MCP server. Pricing is published and self-serve: 6,000 emails/month free, paid plans from $9/month. It holds SOC 2 Type 2, HIPAA, GDPR, ISO 27001, PCI DSS, and a published SLA.

Best for: Prototypes and side projects - free to start, no sales call; Regulated or enterprise workloads - compliance attestations and an enterprise plan; AI agents and automation - an agent-ready surface (MCP / llms.txt).

Mailjet profile →

Best for…

Best overall
Mailjet - our default pick: strongest across pricing, trust and breadth
Best free pick
Mailjet - free tier: 6,000 emails/month, 200 emails per day
Best for enterprise
Mailjet - for regulated or large teams: SOC 2 Type II, HIPAA, published SLA
Cheapest to start
Mailjet - from $9 month to start; compare on your real usage, not the entry price
Best for agents
Mailjet - easiest to wire up programmatically: MCP server
Broadest surface
Brevo - 104 documented actions; breadth isn't quality, but it's the most to build on

Ranked (6)

  • #1 Mailjet

    84 / 100
    • Best overall
    • Best free pick
    • Best for enterprise
    • Cheapest to start
    • Best for agents

    Mailjet is an email platform for transactional and marketing email, built for developers and marketers, with EU data residency in Frankfurt and Belgium. The REST API uses basic auth, webhooks, seven SDKs, and an official MCP server. Pricing is published and self-serve: 6,000 emails/month free, paid plans from $9/month. It holds SOC 2 Type 2, HIPAA, GDPR, ISO 27001, PCI DSS, and a published SLA.

    PricingHybrid · from $9 month · free tier ✓
    TrustSOC 2 Type II · HIPAA · GDPR · ISO 27001 · PCI DSS
    Does
    • Transactional send
    • Marketing / broadcasts
    • Inbound parsing
    • Templates
    • Batch send
    • Scheduled send
    • SMTP relay
    • Dedicated IP
    • Analytics

    Mailjet profile →

  • #2 Brevo

    86 / 100
    • Broadest surface

    Brevo is an all-in-one customer engagement platform spanning transactional and marketing email, SMS, WhatsApp, automation, and CRM. The REST API supports API-key and OAuth2 auth, webhooks, seven SDKs, and an official MCP server. Pricing is published and self-serve with a free tier of 300 emails/day and paid plans from $9/month, and the platform is GDPR and ISO 27001 compliant with a published SLA. Used by eBay, H&M, and Louis Vuitton.

    PricingHybrid · from $9 month · free tier ✓
    TrustGDPR · ISO 27001
    Does
    • Transactional send
    • Marketing / broadcasts
    • Inbound parsing
    • Templates
    • Batch send
    • Scheduled send
    • SMTP relay
    • Dedicated IP
    • Analytics
    Used byeBay, H&M, Louis Vuitton, Sodexo
    Avoid ifYou have strict compliance requirements

    Brevo profile →

  • #3 SendGrid

    67 / 100

    SendGrid, part of Twilio, is a high-scale email platform for transactional and marketing email, with proven deliverability and domain authentication. The REST API supports API-key and basic auth, webhooks, seven SDKs, and an official MCP server, with global and EU regions. Pricing is published and self-serve from about $20/month. It carries SOC 2 Type 2, GDPR, ISO 27001, PCI DSS, and a published SLA. Used by Shopify.

    PricingHybrid · from $19.95 month · free tier ✗
    TrustSOC 2 Type II · GDPR · ISO 27001 · PCI DSS
    Does
    • Transactional send
    • Marketing / broadcasts
    • Inbound parsing
    • Templates
    • Batch send
    • Scheduled send
    • SMTP relay
    • Dedicated IP
    • Email validation
    • Analytics
    Used byShopify
    Avoid ifYou want to try it free before paying

    SendGrid profile →

  • #4 Postmark

    65 / 100

    Postmark is a transactional email service focused on fast, reliable delivery for notifications, password resets, and receipts. The REST API uses API-key auth, webhooks, seven SDKs, and an official MCP server. Pricing is published and self-serve: 100 emails/month free, paid plans from $15/month. It is GDPR compliant. Used by Asana, IKEA, and UNICEF.

    PricingHybrid · from $15 month · free tier ✓
    TrustGDPR
    Does
    • Transactional send
    • Marketing / broadcasts
    • Inbound parsing
    • Templates
    • Batch send
    • SMTP relay
    • Dedicated IP
    • Analytics
    Used byLiveChat, Asana, IKEA, UNICEF
    Avoid ifYou have strict compliance requirements

    Postmark profile →

  • #5 Resend

    82 / 100

    Resend is a developer-first REST email API for transactional, marketing, and inbound mail. It ships API-key auth, webhooks, idempotency keys, six SDKs, and an official MCP server, with multi-region sending across the US, EU, Brazil, and Japan. Pricing is published and self-serve, with a free tier of 3,000 emails/month and paid plans from $20. It carries SOC 2 Type 2, GDPR, and a published SLA. Used by Warner Bros, Gumroad, and Replit.

    PricingHybrid · from $20 1,000 emails · free tier ✓
    TrustSOC 2 Type II · GDPR
    Does
    • Transactional send
    • Marketing / broadcasts
    • Inbound parsing
    • Templates
    • Batch send
    • Scheduled send
    • SMTP relay
    • Dedicated IP
    • Analytics
    Used byWarner Bros, Gumroad, Tailwind, Replit

    Resend profile →

  • #6 SparkPost

    63 / 100

    SparkPost is a developer-friendly email delivery platform for transactional and marketing email, with analytics and critical-alert sending. The REST API supports API-key and basic auth, webhooks, and seven SDKs, across US and EU regions. It is self-serve with a free tier of 500 emails/month and paid plans from $20/month. The platform carries SOC 2 Type 2, HIPAA, GDPR, ISO 27001, and a published SLA. Used by The New York Times, Zillow, and Booking.com.

    PricingHybrid · free tier ✓
    TrustSOC 2 Type II · HIPAA · GDPR · ISO 27001
    Does
    • Transactional send
    • Marketing / broadcasts
    • Inbound parsing
    • Templates
    • Batch send
    • Scheduled send
    • SMTP relay
    • Dedicated IP
    • Email validation
    • Analytics
    Used byThe New York Times, Zillow, Adobe, Booking.com
    Avoid ifYou need transparent pricing up front

    SparkPost profile →

Scope: only APIs with the required capability, picked from published, cited data. The score is one input, not the verdict, and we lead with each one’s trade-off. No reviews yet, no paid placement. See the full Email APIs directory.