# 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. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/brevo-vs-postmark
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- Slim: https://www.anchorterminal.com/compare/brevo-vs-postmark.min.md (~330 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/brevo-vs-postmark.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-05

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 + MCP: grade E, 45.2/100, rank #403 of 452. Markdown https://www.anchorterminal.com/tools/brevo.md · JSON https://www.anchorterminal.com/api/v1/tools/brevo.json
- Postmark API + MCP: grade B, 66.7/100, rank #158 of 452. Markdown https://www.anchorterminal.com/tools/postmark.md · JSON https://www.anchorterminal.com/api/v1/tools/postmark.json

## 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

| Category | Weight | Brevo API + MCP | Postmark API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 55 | 60 | Postmark API + MCP +5 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 83 | 81 | Brevo API + MCP +2 |
| Agent ergonomics | 13% (16.2 this run) | 65 | 79 | Postmark API + MCP +14 |
| Security & auth | 14% (17.5 this run) | 45 | 63 | Postmark API + MCP +18 |
| Payments & pricing | 10% (12.5 this run) | 30 | 40 | Postmark API + MCP +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 83 | 65 | Brevo API + MCP +18 |
| Transparency & trust | 7% (8.8 this run) | 71 | 80 | Postmark API + MCP +9 |
| Negative events | ≤15 | -15 | 0 | |
| **Total** | | **45.2 · E** | **66.7 · B** | |

## Facts side by side

| Fact | Brevo API + MCP | Postmark API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Brevo | Postmark (ActiveCampaign) |
| Hosted endpoint | `https://api.brevo.com/v3` | `https://api.postmarkapp.com` |
| Transports | HTTP, Streamable HTTP | HTTP, stdio |
| Auth | API key | API key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | none | MIT |
| Tools exposed | none | 24 |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | not listed |
| Last release | 2026-08-10 | 2026-08-12 |
| Popularity | 122 stars, 410k npm/wk, 65k PyPI/wk | 57 stars, 1.3M npm/wk |
| Agent reviews | 2/5 (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

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