# CloudPost vs Fastmail API (JMAP) (slim)

> Fastmail scores 54.1 (C) to CloudPost's 20.6 (F) for mailbox access. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/cloudpost-vs-fastmail.md (~2,350 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/cloudpost-vs-fastmail.json · canonical https://www.anchorterminal.com/compare/cloudpost-vs-fastmail
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-10

Fastmail API (JMAP) scores 54.1 (C) on agent readiness against CloudPost's 20.6 (F), and leads in 6 of 7 scored categories. CloudPost leads on maintenance & community. Both do mailbox access.

- CloudPost: F 20.6, rank #956 of 961 · https://www.anchorterminal.com/tools/cloudpost.min.md
- Fastmail API (JMAP): C 54.1, rank #700 of 961 · https://www.anchorterminal.com/tools/fastmail.min.md
- CloudPost, good for A person who wants an agent to triage and answer their own iCloud Mail from Claude or another OAuth-capable MCP client without running an IMAP server locally. Ahead on Maintenance & community, 33 against 26. Also A hosted endpoint, with nothing to install.
- Fastmail API (JMAP), good for An agent working in its owner's own Fastmail mailbox, where JMAP gives batched reads, structured search and state-based sync on an open standard, and MCP gives a ready connection with read, write and send levels. Ahead on Reliability, 54 against 15; Schema & documentation, 52 against 8; Agent ergonomics, 73 against 23; Security & auth, 60 against 36; Payments & pricing, 30 against 20; Transparency & trust, 74 against 10.

| Category | CloudPost | Fastmail API (JMAP) |
| --- | --- | --- |
| Reliability (16%) | 15 | 54 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 8 | 52 |
| Agent ergonomics (13%) | 23 | 73 |
| Security & auth (14%) | 36 | 60 |
| Payments & pricing (10%) | 20 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 33 | 26 |
| Transparency & trust (7%) | 10 | 74 |

| Fact (where they differ) | CloudPost | Fastmail API (JMAP) |
| --- | --- | --- |
| Kind | MCP server | HTTP API |
| Vendor | CloudPost (James Brooks) | Fastmail Pty Ltd |
| Hosted endpoint | `https://cloudpost.ing/api/mcp/mail` | no (local only) |
| Auth | OAuth | OAuth or key |
| Pricing | Free | Paid |
| Licence | Proprietary. No licence or terms published | Proprietary service under Fastmail's API Terms of Service and API Developer Policy. JMAP is an open IETF standard, and the sample code on GitHub is MIT |
| Tools exposed | 9 | none |
| Read-only variant documented | no | yes |
| Last release | 2026-10-10 | 2026-04-22 |
| Terms last updated | no document linked | no date given |
| Privacy policy last updated | no document linked | no date given |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | not found in the text |
| Terms restrict benchmarking |  | yes |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | not found in the text |
| Popularity | none | 123 stars |