# Fastmail API (JMAP) vs Zoho Mail API (slim)

> Fastmail API (JMAP) and Zoho Mail API score within a point of each other on agent readiness, 54.1 (C) and 53.8 (D). Zoho Mail API leads on reliability, security & auth and maintenance & community. Both do mailbox read. Category scores, facts, verdicts and agent notes side by…

- Full: https://www.anchorterminal.com/compare/fastmail-vs-zoho-mail.md (~2,200 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/fastmail-vs-zoho-mail.json · canonical https://www.anchorterminal.com/compare/fastmail-vs-zoho-mail
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

Fastmail API (JMAP) and Zoho Mail API score within a point of each other on agent readiness, 54.1 (C) and 53.8 (D). Zoho Mail API leads on reliability, security & auth and maintenance & community. Both do mailbox read.

- Fastmail API (JMAP): C 54.1, rank #620 of 842 · https://www.anchorterminal.com/tools/fastmail.min.md
- Zoho Mail API: D 53.8, rank #626 of 842 · https://www.anchorterminal.com/tools/zoho-mail.min.md
- 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 Schema & documentation, 52 against 45; Agent ergonomics, 73 against 56.
- Zoho Mail API, good for An agent working inside its owner's Zoho Mail mailbox or administering a Zoho Mail organisation, where narrow scopes and the MCP server keep access small. Ahead on Reliability, 63 against 54; Security & auth, 67 against 60; Maintenance & community, 33 against 26. Also Free to start without a card.

| Category | Fastmail API (JMAP) | Zoho Mail API |
| --- | --- | --- |
| Reliability (16%) | 54 | 63 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 52 | 45 |
| Agent ergonomics (13%) | 73 | 56 |
| Security & auth (14%) | 60 | 67 |
| Payments & pricing (10%) | 30 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 26 | 33 |
| Transparency & trust (7%) | 74 | 73 |

| Fact (where they differ) | Fastmail API (JMAP) | Zoho Mail API |
| --- | --- | --- |
| Vendor | Fastmail Pty Ltd | Zoho |
| Auth | OAuth or key | OAuth |
| Pricing | Paid | Freemium |
| Licence | 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 | Proprietary service under the Zoho Terms of Service and the Zoho Mail usage policy. No source repository was found |
| Read-only variant documented | yes | no |
| llms.txt | no | yes |
| Last release | 2026-04-22 | none |
| Terms last updated | no date given | 2022-03-02 |
| Privacy policy last updated | no date given | 2025-12-22 |
| Customer content may train models | not found in the text | yes |
| Popularity | 123 stars | none |