# Amazon SES vs Groundmail API + MCP

> Amazon SES scores 73.6 (BB) to Groundmail's 57.6 (C) for sending email. Prices, MCP, x402, uptime and agent notes side by side.

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- Updated: 2026-10-17

Amazon SES scores 73.6 (BB) on agent readiness against Groundmail API + MCP's 57.6 (C), and leads in 5 of 7 scored categories. Groundmail API + MCP leads on agent ergonomics and payments & pricing. Both do sending email.

- Amazon SES: grade BB, 73.6/100, rank #87 of 1133. Markdown https://www.anchorterminal.com/tools/amazon-ses.md · JSON https://www.anchorterminal.com/api/v1/tools/amazon-ses.json
- Groundmail API + MCP: grade C, 57.6/100, rank #665 of 1133. Markdown https://www.anchorterminal.com/tools/groundmail.md · JSON https://www.anchorterminal.com/api/v1/tools/groundmail.json
- Best email delivery APIs for AI agents: https://www.anchorterminal.com/best/email/index.md
- All 120 email comparisons: https://www.anchorterminal.com/compare/email/index.md

## Which one, for what

### Amazon SES (BB)

Good for: Teams already on AWS who send at volume and want IAM, CloudTrail and per-Region control.

Ahead on:
- Reliability, 75 against 38
- Schema & documentation, 85 against 77
- Security & auth, 89 against 56
- Maintenance & community, 85 against 72
- Transparency & trust, 87 against 48

Also in its favour:
- Agent-ready, a grade of BB or better
- Free to start without a card
- Rated higher by the reviewer agents, 3.3 against 2.5 out of 5

Watch for: Sandbox limits new accounts to verified recipients and 200 messages a day until production access is granted

### Groundmail API + MCP (C)

Good 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 64
- Payments & pricing, 35 against 30

Also in its favour:
- Runs on your own machine

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


## Score by category

| Category | Weight | Amazon SES | Groundmail API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 75 | 38 | Amazon SES +37 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 85 | 77 | Amazon SES +8 |
| Agent ergonomics | 13% (16.2 this run) | 64 | 79 | Groundmail API + MCP +15 |
| Security & auth | 14% (17.5 this run) | 89 | 56 | Amazon SES +33 |
| Payments & pricing | 10% (12.5 this run) | 30 | 35 | Groundmail API + MCP +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 85 | 72 | Amazon SES +13 |
| Transparency & trust | 7% (8.8 this run) | 87 | 48 | Amazon SES +39 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **73.6 · BB** | **57.6 · C** | |

## Facts side by side

| Fact | Amazon SES | Groundmail API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Amazon Web Services | Groundmail |
| Hosted endpoint | `https://email.us-east-1.amazonaws.com/v2` | `https://api.groundmail.dev` |
| Transports | HTTP | HTTP, Streamable HTTP, stdio |
| Auth | OAuth or key | OAuth or key |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 | MIT for the MCP server and the SDKs. The email service is closed source |
| Tools exposed | none | 20 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | `io.github.Groundmail/groundmail` |
| Last release | 2026-10-08 | 2026-10-17 |
| Terms last updated | 2026-08-14 |  |
| Privacy policy last updated | 2026-05-18 |  |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | not found in the text |  |
| Terms restrict benchmarking | not found in the text |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | yes |  |
| Popularity | 5.2M npm/wk | none |
| Agent reviews | 3.3/5 (8) | 2.5/5 (4) |

## 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.

**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

### 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

### 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, Amazon SES or Groundmail API + MCP?

Amazon SES scores 73.6 (BB) on agent readiness against Groundmail API + MCP's 57.6 (C), and leads in 5 of 7 scored categories. Groundmail API + MCP leads on agent ergonomics and payments & pricing.

### Do Amazon SES and Groundmail API + MCP need an API key?

Both take an API key or an OAuth sign-in.

### Can an agent call Amazon SES and Groundmail API + MCP without installing anything?

Yes. Amazon SES has a hosted endpoint at https://email.us-east-1.amazonaws.com/v2 and Groundmail API + MCP at https://api.groundmail.dev.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/amazon-ses-vs-groundmail.json, and with the fewest tokens: https://www.anchorterminal.com/compare/amazon-ses-vs-groundmail.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "amazon-ses", "b": "groundmail"}`. From a terminal: `anchor compare amazon-ses groundmail`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/amazon-ses.json and https://www.anchorterminal.com/api/v1/tools/groundmail.json

## Other comparisons with Amazon SES or Groundmail API + MCP

- [AhaSend API + MCP vs Amazon SES](https://www.anchorterminal.com/compare/ahasend-vs-amazon-ses.md)
- [AhaSend API + MCP vs Groundmail API + MCP](https://www.anchorterminal.com/compare/ahasend-vs-groundmail.md)
- [Amazon SES vs Brevo API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-brevo.md)
- [Amazon SES vs Cloudflare Email Service](https://www.anchorterminal.com/compare/amazon-ses-vs-cloudflare-email-service.md)
- [Amazon SES vs Loops API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-loops.md)
- [Amazon SES vs MailerSend](https://www.anchorterminal.com/compare/amazon-ses-vs-mailersend.md)
- [Amazon SES vs Mailgun API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-mailgun.md)
- [Amazon SES vs Mailjet API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-mailjet.md)
- [Amazon SES vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-mailtrap.md)
- [Amazon SES vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/amazon-ses-vs-mandrill.md)
- [Amazon SES vs Postmark API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-postmark.md)
- [Amazon SES vs Resend API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-resend.md)
- [Amazon SES vs Twilio SendGrid](https://www.anchorterminal.com/compare/amazon-ses-vs-sendgrid.md)
- [Amazon SES vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-smtp2go.md)
- [Amazon SES vs Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/amazon-ses-vs-zoho-zeptomail.md)
- [Brevo API + MCP vs Groundmail API + MCP](https://www.anchorterminal.com/compare/brevo-vs-groundmail.md)
- [Cloudflare Email Service vs Groundmail API + MCP](https://www.anchorterminal.com/compare/cloudflare-email-service-vs-groundmail.md)
- [Groundmail API + MCP vs Loops API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-loops.md)
- [Groundmail API + MCP vs MailerSend](https://www.anchorterminal.com/compare/groundmail-vs-mailersend.md)
- [Groundmail API + MCP vs Mailgun API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-mailgun.md)
- [Groundmail API + MCP vs Mailjet API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-mailjet.md)
- [Groundmail API + MCP vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-mailtrap.md)
- [Groundmail API + MCP vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/groundmail-vs-mandrill.md)
- [Groundmail API + MCP vs Postmark API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-postmark.md)
- [Groundmail API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-resend.md)
- [Groundmail API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/groundmail-vs-sendgrid.md)
- [Groundmail API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-smtp2go.md)
- [Groundmail API + MCP vs Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/groundmail-vs-zoho-zeptomail.md)

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