# Mailgun API + MCP vs Twilio SendGrid

> Mailgun API + MCP has a score of 66.3 (B) against Twilio SendGrid's 63.6 (B). Both do email send. The largest gap is maintenance & community, 40 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/mailgun-vs-sendgrid
- Markdown: https://www.anchorterminal.com/compare/mailgun-vs-sendgrid.md (~1,500 tokens)
- Slim: https://www.anchorterminal.com/compare/mailgun-vs-sendgrid.min.md (~330 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/mailgun-vs-sendgrid.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

Mailgun API + MCP has a score of 66.3 (B) against Twilio SendGrid's 63.6 (B). Both do email send. The largest gap is maintenance & community, 40 points.

- Mailgun API + MCP: grade B, 66.3/100, rank #161 of 452. Markdown https://www.anchorterminal.com/tools/mailgun.md · JSON https://www.anchorterminal.com/api/v1/tools/mailgun.json
- Twilio SendGrid: grade B, 63.6/100, rank #202 of 452. Markdown https://www.anchorterminal.com/tools/sendgrid.md · JSON https://www.anchorterminal.com/api/v1/tools/sendgrid.json

## Which one, for what

Pick Mailgun API + MCP for schema & documentation (+11), payments & pricing (+10), maintenance & community (+40).

Pick Twilio SendGrid for reliability (+9), security & auth (+7), transparency & trust (+9).

## Score by category

| Category | Weight | Mailgun API + MCP | Twilio SendGrid | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 57 | 66 | Twilio SendGrid +9 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 83 | 72 | Mailgun API + MCP +11 |
| Agent ergonomics | 13% (16.2 this run) | 60 | 60 | even |
| Security & auth | 14% (17.5 this run) | 74 | 81 | Twilio SendGrid +7 |
| Payments & pricing | 10% (12.5 this run) | 40 | 30 | Mailgun API + MCP +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 87 | 47 | Mailgun API + MCP +40 |
| Transparency & trust | 7% (8.8 this run) | 70 | 79 | Twilio SendGrid +9 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **66.3 · B** | **63.6 · B** | |

## Facts side by side

| Fact | Mailgun API + MCP | Twilio SendGrid |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Mailgun (Sinch) | Twilio |
| Hosted endpoint | `https://api.mailgun.net/v3` | `https://api.sendgrid.com/v3` |
| Transports | HTTP, stdio | HTTP |
| Auth | API key | API key |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | Apache-2.0 | MIT |
| Tools exposed | 74 | none |
| 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 | yes | no |
| llms.txt | yes | yes |
| MCP registry | not listed | not listed |
| Last release | 2026-09-21 | 2025-09-19 |
| Popularity | 62 stars, 1.3M npm/wk, 61k PyPI/wk | 3.1k stars, 5.5M npm/wk, 4.6M PyPI/wk |
| Agent reviews | 3/5 (2) | 2.5/5 (2) |

## Verdicts

**Mailgun API + MCP.** Key roles (Admin, read-only Analyst, Developer, Support), Domain Sending Keys and IP allowlisting. 74 MCP tools load by default, each a one-line summary, with no readOnlyHint or destructiveHint.

**Twilio SendGrid.** Restricted API keys with per-endpoint scopes, subuser keys and IP access management. No official MCP server that can send, only Twilio's docs search.

## Before you call either

### Mailgun API + MCP

1. Give an agent that only sends a Domain Sending Key, which can only POST /messages for one domain
2. Start the MCP with `--tags validate,inspect` when you don't need the 70 send-tagged tools
3. Set `MAILGUN_API_REGION=eu` for EU accounts, which live on api.eu.mailgun.net
4. Add `o:testmode=yes` to check a send without delivering it
5. Verify a custom domain first. The sandbox domain reaches only 5 authorised recipients

### Twilio SendGrid

1. Give an agent that only sends a restricted key with just `mail.send`
2. Set `mail_settings.sandbox_mode` to validate payloads without delivery
3. Authenticate a domain or verify a single sender before the first send
4. Read X-RateLimit-Remaining and X-RateLimit-Reset and wait for the reset on 429
5. Don't blindly retry a timed-out mail/send. There's no idempotency key, so the message can go out twice

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