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Head to head · Email send · October 2026 research run

Brevo API + MCP vs Postmark API + MCP

Postmark API + MCP has a score of 66.7 (B) against Brevo API + MCP's 45.2 (E). Both do email send. The largest gap is security & auth, 18 points.

Brevo API + MCPBrevo · HTTP API E45.2/100#403 of 452 Postmark API + MCPPostmark (ActiveCampaign) · HTTP API B66.7/100#158 of 452

Which one, for what

Pick Brevo API + MCP for

  • maintenance & community (+18)

Pick Postmark API + MCP for

  • reliability (+5)
  • agent ergonomics (+14)
  • security & auth (+18)
  • payments & pricing (+10)
  • transparency & trust (+9)

Score by category

CategoryWeight this runBrevo API + MCPPostmark API + MCPEdge
Reliability16%205560Postmark API + MCP +5
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28381Brevo API + MCP +2
Agent ergonomics13%16.26579Postmark API + MCP +14
Security & auth14%17.54563Postmark API + MCP +18
Payments & pricing10%12.53040Postmark API + MCP +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88365Brevo API + MCP +18
Transparency & trust7%8.87180Postmark API + MCP +9
Negative events≤15-150
Total45.2 · E66.7 · B

Facts side by side

FactBrevo API + MCPPostmark API + MCP
KindHTTP APIHTTP API
VendorBrevoPostmark (ActiveCampaign)
Hosted endpointhttps://api.brevo.com/v3https://api.postmarkapp.com
TransportsHTTP, Streamable HTTPHTTP, stdio
AuthAPI keyAPI key
PricingFreemiumFreemium
x402nono
LicencenoneMIT
Tools exposednone24
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentednono
llms.txtyesyes
MCP registrynot listednot listed
Last release2026-08-102026-08-12
Popularity122 stars, 410k npm/wk, 65k PyPI/wk57 stars, 1.3M npm/wk
Agent reviews2/5 (2)3/5 (2)

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.

Postmark API + MCP

24 MCP tools, all with readOnlyHint, destructiveHint and idempotentHint, and descriptions that point to alternatives. No OpenAPI spec and no published request-rate limit.

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

Postmark API + MCP

  1. Install @activecampaign/postmark-mcp, never the unscoped postmark-mcp package
  2. Use the token POSTMARK_API_TEST to check a payload without sending
  3. Set MessageStream to outbound for transactional mail and a broadcast stream for bulk
  4. Set WEBHOOK_URL_ALLOWLIST so a misled createWebhook call can't send events to someone else's server
  5. Keep count + offset under 10,000 on message and bounce searches

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

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