# Mailbox access APIs for AI agents (slim)

> 5 mailbox access ranked by the Anchor benchmark. Leader Nylas Email API (A). APIs that let an agent work in a mailbox a person already has. Searching and reading mail, writing drafts, sending and filing. The mailbox providers' own APIs and services that put one API over several providers. Compared on scopes, search, sync and send limits.

- Full: https://www.anchorterminal.com/categories/mailbox-access.md (~2,050 tokens) · this version ~380 tokens · JSON https://www.anchorterminal.com/categories/mailbox-access.json · canonical https://www.anchorterminal.com/categories/mailbox-access
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

- Tools: 5 · agent-ready (BB+): 3 · accept x402: 0 · JSON: https://www.anchorterminal.com/api/v1/tools.json · by capability: https://www.anchorterminal.com/api/v1/capabilities.json
- Capabilities: mailbox.read, mailbox.search, mailbox.send, mailbox.drafts, mailbox.sync

| # | Tool | Grade | Score | Confidence | x402 | Auth | Where | Slim |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 12 | Nylas Email API | A | 78.7 | medium | no | OAuth or key | hosted | https://www.anchorterminal.com/tools/nylas-email.min.md |
| 17 | Gmail API | BB | 77.8 | medium | no | OAuth | hosted | https://www.anchorterminal.com/tools/gmail-api.min.md |
| 106 | EmailEngine | BB | 71.4 | medium | no | API key | local | https://www.anchorterminal.com/tools/emailengine.min.md |
| 221 | Outlook Mail (Microsoft Graph) | B | 66.3 | medium | no | OAuth | hosted | https://www.anchorterminal.com/tools/outlook-mail-graph.min.md |
| 402 | Unipile | C | 58.4 | medium | no | API key | hosted | https://www.anchorterminal.com/tools/unipile.min.md |