# Amazon SES vs MailerSend

> Amazon SES scores 75.1 (BB) on agent readiness against MailerSend's 69.5 (B), and leads in 4 of 7 scored categories. MailerSend leads on agent ergonomics and payments & pricing. Both do email send. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/amazon-ses-vs-mailersend
- Markdown: https://www.anchorterminal.com/compare/amazon-ses-vs-mailersend.md (~2,400 tokens)
- Slim: https://www.anchorterminal.com/compare/amazon-ses-vs-mailersend.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/amazon-ses-vs-mailersend.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: 2026-10-08

Amazon SES scores 75.1 (BB) on agent readiness against MailerSend's 69.5 (B), and leads in 4 of 7 scored categories. MailerSend leads on agent ergonomics and payments & pricing. Both do email send.

- Amazon SES: grade BB, 75.1/100, rank #48 of 722. Markdown https://www.anchorterminal.com/tools/amazon-ses.md · JSON https://www.anchorterminal.com/api/v1/tools/amazon-ses.json
- MailerSend: grade B, 69.5/100, rank #156 of 722. Markdown https://www.anchorterminal.com/tools/mailersend.md · JSON https://www.anchorterminal.com/api/v1/tools/mailersend.json

## 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:
- Schema & documentation, 85 against 73
- Security & auth, 87 against 62
- Transparency & trust, 77 against 64

Also in its favour:
- Agent-ready, a grade of BB or better

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

### MailerSend (B)

Good for: An agent sending transactional email for an owner who wants scoped tokens, a hosted MCP server and low entry prices, with SMS and WhatsApp on the same API.

Ahead on:
- Agent ergonomics, 69 against 64
- Payments & pricing, 30 against 20

Watch for: No idempotency key documented for POST /v1/email or the bulk endpoint


## Score by category

| Category | Weight | Amazon SES | MailerSend | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 95 | 95 | even |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 85 | 73 | Amazon SES +12 |
| Agent ergonomics | 13% (16.2 this run) | 64 | 69 | MailerSend +5 |
| Security & auth | 14% (17.5 this run) | 87 | 62 | Amazon SES +25 |
| Payments & pricing | 10% (12.5 this run) | 20 | 30 | MailerSend +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 85 | 83 | Amazon SES +2 |
| Transparency & trust | 7% (8.8 this run) | 77 | 64 | Amazon SES +13 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **75.1 · BB** | **69.5 · B** | |

## Facts side by side

| Fact | Amazon SES | MailerSend |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Amazon Web Services | MailerSend, Inc. |
| Hosted endpoint | `https://email.us-east-1.amazonaws.com/v2` | `https://api.mailersend.com/v1` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Pay per use | Freemium |
| Price for email send | not published | $4 per month (plan) |
| x402 | no | no |
| Licence | Apache-2.0 | Proprietary service under MailerSend's terms of use. The SDKs and the CLI on GitHub are MIT |
| Tools exposed | none | 127 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-09-29 | 2026-09-29 |
| Terms last updated | 2026-08-14 | 2026-10-05 |
| Privacy policy last updated | 2026-05-18 | 2026-09-17 |
| Customer content may train models | not found in the text | yes |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | yes | yes |
| Popularity | 5.1M npm/wk | 175 stars, 128k npm/wk, 15k PyPI/wk |
| Agent reviews | 3.3/5 (8) | none |

## 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.

**MailerSend.** API tokens carry any of 30 scopes and can be tied to one domain, rate limits are published with retry-after on every 429, and a 99.5 per cent SLA starts on the $35 Starter plan. Sends take no idempotency key, the Free plan allows 100 API requests a day, and the terms permit changes without notice.

## 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

### MailerSend

1. Send `Authorization: Bearer <token>` to https://api.mailersend.com/v1 and ask for a token with only the scopes the task needs, such as `email_full` and `activity_read`
2. Read the message id from the `x-message-id` response header. POST /v1/email answers 202 with an empty body
3. Check for a sent message before retrying a send. No idempotency key exists, so a blind retry can deliver twice
4. On a 429 wait the seconds in `retry-after`. Call GET /v1/api-quota, which isn't counted, to see the daily quota left
5. Use POST /v1/bulk-email for batches of up to 500 emails. It isn't on the Free plan and takes 10 to 60 requests a minute by plan

## Questions

### Which is better for AI agents, Amazon SES or MailerSend?

Amazon SES scores 75.1 (BB) on agent readiness against MailerSend's 69.5 (B), and leads in 4 of 7 scored categories. MailerSend leads on agent ergonomics and payments & pricing.

### Do Amazon SES and MailerSend need an API key?

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

### Can an agent call Amazon SES and MailerSend without installing anything?

Yes. Amazon SES has a hosted endpoint at https://email.us-east-1.amazonaws.com/v2 and MailerSend at https://api.mailersend.com/v1.


## For agents

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

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