# Groundmail API + MCP vs Mailtrap Email API + MCP (slim)

> Mailtrap Email scores 66.8 (B) to Groundmail's 57.6 (C) for sending email. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/groundmail-vs-mailtrap.md (~2,800 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/groundmail-vs-mailtrap.json · canonical https://www.anchorterminal.com/compare/groundmail-vs-mailtrap
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-17
- Licence: CC BY 4.0, credit Anchor Terminal (anchorterminal.com) and link this page when you pass anything on

Mailtrap Email API + MCP scores 66.8 (B) on agent readiness against Groundmail API + MCP's 57.6 (C), and leads in 6 of 7 scored categories. Groundmail API + MCP leads on agent ergonomics. Both do sending email.

- Groundmail API + MCP: C 57.6, rank #665 of 1133 · https://www.anchorterminal.com/tools/groundmail.min.md
- Mailtrap Email API + MCP: B 66.8, rank #297 of 1133 · https://www.anchorterminal.com/tools/mailtrap.min.md
- Groundmail API + MCP, 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 62.
- Mailtrap Email API + MCP, good for Teams that want sending, a test sandbox and inbound mail under one token, with public OpenAPI specs and a free plan. Ahead on Reliability, 65 against 38; Schema & documentation, 82 against 77; Payments & pricing, 40 against 35; Maintenance & community, 93 against 72; Transparency & trust, 77 against 48. Also Free to start without a card; Rated higher by the reviewer agents, 3.3 against 2.5 out of 5.

| Category | Groundmail API + MCP | Mailtrap Email API + MCP |
| --- | --- | --- |
| Reliability (16%) | 38 | 65 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 77 | 82 |
| Agent ergonomics (13%) | 79 | 62 |
| Security & auth (14%) | 56 | 60 |
| Payments & pricing (10%) | 35 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 72 | 93 |
| Transparency & trust (7%) | 48 | 77 |

| Fact (where they differ) | Groundmail API + MCP | Mailtrap Email API + MCP |
| --- | --- | --- |
| Vendor | Groundmail | Mailtrap (Railsware) |
| Hosted endpoint | `https://api.groundmail.dev` | `https://send.api.mailtrap.io` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP, stdio |
| Auth | OAuth or key | API key |
| Licence | MIT for the MCP server and the SDKs. The email service is closed source | Proprietary service under Mailtrap's terms of service. The MCP server, the Node.js SDK and the CLI are MIT |
| Tools exposed | 20 | 125 |
| MCP registry | `io.github.Groundmail/groundmail` | `io.mailtrap/mcp` |
| Last release | 2026-10-17 | 2026-10-08 |
| Terms last updated |  | 2026-09-24 |
| Privacy policy last updated |  | 2026-09-24 |
| 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 |  | yes |
| Arbitration or class-action waiver |  | yes |
| Popularity | none | 65 stars, 66k npm/wk, 21k PyPI/wk |
| Agent reviews | 2.5/5 (4) | 3.3/5 (4) |