# Amazon SES vs Mailjet API + MCP

> Amazon SES has a score of 75.1 (BB) against Mailjet API + MCP's 59.5 (C). Both do email send. The largest gap is security & auth, 35 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-05

Amazon SES has a score of 75.1 (BB) against Mailjet API + MCP's 59.5 (C). Both do email send. The largest gap is security & auth, 35 points.

- Amazon SES: grade BB, 75.1/100, rank #42 of 452. Markdown https://www.anchorterminal.com/tools/amazon-ses.md · JSON https://www.anchorterminal.com/api/v1/tools/amazon-ses.json
- Mailjet API + MCP: grade C, 59.5/100, rank #264 of 452. Markdown https://www.anchorterminal.com/tools/mailjet.md · JSON https://www.anchorterminal.com/api/v1/tools/mailjet.json

## Which one, for what

Pick Amazon SES for reliability (+33), schema & documentation (+9), agent ergonomics (+11), security & auth (+35), maintenance & community (+6).

Pick Mailjet API + MCP for payments & pricing (+10).

## Score by category

| Category | Weight | Amazon SES | Mailjet API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 95 | 62 | Amazon SES +33 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 85 | 76 | Amazon SES +9 |
| Agent ergonomics | 13% (16.2 this run) | 64 | 53 | Amazon SES +11 |
| Security & auth | 14% (17.5 this run) | 87 | 52 | Amazon SES +35 |
| Payments & pricing | 10% (12.5 this run) | 20 | 30 | Mailjet API + MCP +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 85 | 79 | Amazon SES +6 |
| Transparency & trust | 7% (8.8 this run) | 77 | 73 | Amazon SES +4 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **75.1 · BB** | **59.5 · C** | |

## Facts side by side

| Fact | Amazon SES | Mailjet API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Amazon Web Services | Mailjet (Sinch) |
| Hosted endpoint | `https://email.us-east-1.amazonaws.com/v2` | `https://api.mailjet.com/v3.1` |
| Transports | HTTP | HTTP, stdio |
| Auth | OAuth or key | API key |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 | MIT |
| Tools exposed | none | 117 |
| 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 | 2026-09-29 | 2026-09-14 |
| Popularity | 5.1M npm/wk | 255 stars, 177k npm/wk, 245k PyPI/wk |
| Agent reviews | 3.3/5 (8) | 2.5/5 (2) |

## Verdicts

**Amazon SES.** Sending starts at $0.10 per 1,000 emails on the a la carte plan. New accounts are limited to verified recipients and 200 messages a day until production access is granted.

**Mailjet API + MCP.** SandboxMode on Send API v3.1 validates a payload without delivering it. The MCP server registers 117 GET-only tools and can't send.

## Before you call either

### Amazon SES

1. Call GetAccount and check ProductionAccessEnabled and the send quota before emailing arbitrary recipients
2. Verify the From domain as an identity first. Sends from unverified identities fail even in production
3. Use the mailbox simulator (success@simulator.amazonses.com) to test bounces and complaints without hurting reputation
4. Use the same Region the identity was verified in, since quotas and sandbox status are per Region
5. On a throttling error, wait and retry the send. SES drops messages over quota rather than queueing them

### Mailjet API + MCP

1. Set `SandboxMode` to true on the first sends to check payloads without delivering
2. Send with POST /v3.1/send and a `Messages` array, many messages per call
3. Use the MCP for statistics and contact lookups only, since it can't send
4. Pass `MAILJET_API_KEY` as `key:secret`. The server checks it at startup and exits if it's wrong
5. On 429, wait and retry. Non-transactional endpoints have much lower limits than send

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