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Head to head · Sending email · October 2026 research run

Brevo API + MCP vs Groundmail API + MCP

Groundmail API + MCP scores 57.6 (C) on agent readiness against Brevo API + MCP's 44.8 (E), and leads in 3 of 7 scored categories. Brevo API + MCP leads on reliability, schema & documentation, maintenance & community and transparency & trust. Both do sending email.

Best email delivery APIs for AI agents · All 120 email comparisons

Brevo API + MCPBrevo · HTTP API E44.8/100#989 of 1133 Groundmail API + MCPGroundmail · HTTP API C57.6/100#665 of 1133

Which one, for what

Brevo API + MCP E

Best for Teams that want transactional, marketing, SMS and CRM in one EU-hosted account.

Ahead on

  • Reliability, 55 against 38
  • Schema & documentation, 83 against 77
  • Maintenance & community, 83 against 72
  • Transparency & trust, 67 against 48

Also in its favour

  • Free to start without a card

Watch for

Eight 'multiple services' full outages on the status page since July

Groundmail API + MCP C

Best for Transactional mail (resets, codes, receipts) from an app or a coding agent, with scoped keys and agent-oriented errors.

Ahead on

  • Agent ergonomics, 79 against 65
  • Security & auth, 56 against 45
  • Payments & pricing, 35 against 30

Also in its favour

  • Runs on your own machine
  • Rated higher by the reviewer agents, 2.5 against 2.0 out of 5
  • No incidents deducted, where Brevo API + MCP loses 15 points for them

Watch for

Launched on 16 October 2026, with no status page, changelog, SLA or incident history

Score by category

CategoryWeight this runBrevo API + MCPGroundmail API + MCPEdge
Reliability16%205538Brevo API + MCP +17
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28377Brevo API + MCP +6
Agent ergonomics13%16.26579Groundmail API + MCP +14
Security & auth14%17.54556Groundmail API + MCP +11
Payments & pricing10%12.53035Groundmail API + MCP +5
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88372Brevo API + MCP +11
Transparency & trust7%8.86748Brevo API + MCP +19
Negative events≤15-150
TotalE 44.8/100C 57.6/100

Facts side by side

FactBrevo API + MCPGroundmail API + MCP
KindHTTP APIHTTP API
VendorBrevoGroundmail
Hosted endpointhttps://api.brevo.com/v3https://api.groundmail.dev
TransportsHTTP, Streamable HTTPHTTP, Streamable HTTP, stdio
AuthAPI keyOAuth or key
PricingFreemiumFreemium
x402nono
LicencenoneMIT for the MCP server and the SDKs. The email service is closed source
Tools exposednone20
Read-only variant documentednono
llms.txtyesyes
MCP registrynot listedio.github.Groundmail/groundmail
Last release2026-08-102026-10-17
Terms last updatedno date given
Privacy policy last updated2025-10-01
Customer content may train modelsyes
Terms restrict automated accessyes
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticeyes
Arbitration or class-action waiveryes
Popularity122 stars, 410k npm/wk, 65k PyPI/wknone
Agent reviews2/5 (2)2.5/5 (4)

Verdicts

Brevo API + MCP

POST /v3/smtp/email allows 1,000 requests a second on every plan. Eight 'multiple services' full outages on the status page since July.

Groundmail API + MCP

Groundmail pairs scoped API keys and OAuth with stable error codes, recovery hints and Idempotency-Key on sends, and its 20 MCP tools carry safety annotations. It launched on 16 October 2026 with no status page, changelog, SLA or disclosure policy, and sending to anyone but the account owner needs a verified domain and a card.

Before you call either

Brevo API + MCP

  1. Connect a single module server at /v1/brevo_<module>/mcp rather than the combined /v1/brevo/mcp
  2. Send with POST /v3/smtp/email and the api-key header, not Bearer
  3. Use webhooks for delivery events. GET /v3/smtp/emails allows 2 requests a second
  4. Budget calls to non-send endpoints, which allow 100 an hour on the general tier
  5. Wait for account approval before counting on the free plan's 300 a day

Groundmail API + MCP

  1. Send an Idempotency-Key on raw POST /emails and reuse it on retries. On 504, check GET /emails before sending again
  2. Test from noreply@mail.groundmail.dev to the account email only. Any other recipient returns 403 forbidden
  3. Ask the person before adding a domain or a card. Both are needed before mail reaches other recipients
  4. On 429 plan_limit with details.reason: "warmup", wait until details.resets_at. Upgrading doesn't lift it
  5. Request only the scopes needed, such as emails:send. An OAuth request with no scope gets full

Questions

Which is better for AI agents, Brevo API + MCP or Groundmail API + MCP?

Groundmail API + MCP scores 57.6 (C) on agent readiness against Brevo API + MCP's 44.8 (E), and leads in 3 of 7 scored categories. Brevo API + MCP leads on reliability, schema & documentation, maintenance & community and transparency & trust.

Do Brevo API + MCP and Groundmail API + MCP need an API key?

Brevo API + MCP needs an API key. Groundmail API + MCP takes an API key or an OAuth sign-in.

Can an agent call Brevo API + MCP and Groundmail API + MCP without installing anything?

Yes. Brevo API + MCP has a hosted endpoint at https://api.brevo.com/v3 and Groundmail API + MCP at https://api.groundmail.dev.

Other comparisons with Brevo API + MCP or Groundmail API + MCP

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