# EmailEngine vs Himalaya

> EmailEngine scores 71.4 (BB) to Himalaya's 64.5 (B) for mailbox access. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/emailengine-vs-himalaya
- Markdown: https://www.anchorterminal.com/compare/emailengine-vs-himalaya.md (~2,250 tokens)
- Slim: https://www.anchorterminal.com/compare/emailengine-vs-himalaya.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/emailengine-vs-himalaya.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: 2026-10-09

EmailEngine scores 71.4 (BB) on agent readiness against Himalaya's 64.5 (B), and leads in 4 of 7 scored categories. Himalaya leads on reliability, payments & pricing and maintenance & community. Both do mailbox access.

- EmailEngine: grade BB, 71.4/100, rank #128 of 950. Markdown https://www.anchorterminal.com/tools/emailengine.md · JSON https://www.anchorterminal.com/api/v1/tools/emailengine.json
- Himalaya: grade B, 64.5/100, rank #348 of 950. Markdown https://www.anchorterminal.com/tools/himalaya.md · JSON https://www.anchorterminal.com/api/v1/tools/himalaya.json
- Best mailbox access APIs for AI agents: https://www.anchorterminal.com/best/mailbox-access/index.md
- All 36 mailboxes comparisons: https://www.anchorterminal.com/compare/mailbox-access/index.md

## Which one, for what

### EmailEngine (BB)

Good for: A team that must keep mailbox access on its own infrastructure, has many mailboxes across Gmail, Microsoft 365 and IMAP, and can run a server and Redis.

Ahead on:
- Schema & documentation, 91 against 70
- Agent ergonomics, 80 against 65
- Security & auth, 71 against 43

Also in its favour:
- Agent-ready, a grade of BB or better

Watch for: Not open source. Running it beyond the 14-day trial needs a subscription at $1,450 or EUR 1,200 a year

### Himalaya (B)

Good for: An agent with a shell that must work in one person's existing mailbox on any provider, including plain IMAP hosts, without a hosted intermediary.

Ahead on:
- Reliability, 84 against 79
- Payments & pricing, 60 against 40
- Maintenance & community, 88 against 81

Also in its favour:
- Free to start without a card
- Open source

Watch for: Until 2.2.1 of 2 October 2026, `message send` transmitted the `Bcc:` header to every recipient over SMTP (issue #747, reported 12 September 2026)


## Score by category

| Category | Weight | EmailEngine | Himalaya | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 79 | 84 | Himalaya +5 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 91 | 70 | EmailEngine +21 |
| Agent ergonomics | 13% (16.2 this run) | 80 | 65 | EmailEngine +15 |
| Security & auth | 14% (17.5 this run) | 71 | 43 | EmailEngine +28 |
| Payments & pricing | 10% (12.5 this run) | 40 | 60 | Himalaya +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 81 | 88 | Himalaya +7 |
| Transparency & trust | 7% (8.8 this run) | 72 | 69 | EmailEngine +3 |
| Negative events | ≤15 | -3 | -3 | |
| **Total** | | **71.4 · BB** | **64.5 · B** | |

## Facts side by side

| Fact | EmailEngine | Himalaya |
| --- | --- | --- |
| Kind | HTTP API | SDK + MCP |
| Vendor | Postal Systems OÜ | Pimalaya |
| Hosted endpoint | no (local only) | no (local only) |
| Transports | HTTP |  |
| Auth | API key | OAuth or key |
| Pricing | Paid | Free |
| x402 | no | no |
| Licence | Source available under the EmailEngine licence agreement, version 2.1 of 17 October 2023. Not open source. The PHP SDK is MIT | MIT OR Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| Last release | 2026-10-05 | 2026-10-02 |
| Terms last updated | no date given | no document linked |
| Privacy policy last updated | no date given | no document linked |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | yes |  |
| Terms restrict benchmarking | not found in the text |  |
| Terms or service can change without notice | yes |  |
| Arbitration or class-action waiver | not found in the text |  |
| Popularity | 2.2k stars, 388 npm/wk | 7.4k stars |

## Verdicts

**EmailEngine.** A self-hosted REST API over Gmail, Microsoft 365 and IMAP, with a public OpenAPI 3.0 spec and tokens that can be bound to one account, limited by action and group, and rate limited. It needs a server, Redis and a $1,450 yearly licence after a 14-day trial, and the MCP endpoint is a beta, off by default.

**Himalaya.** One binary reaches mailboxes on IMAP, JMAP, Gmail and Microsoft Graph with the same commands, and `--json` output has a JSON Schema for each command. The agent holds the mailbox's own credential with no read-only mode, and a flaw that exposed Bcc recipients over SMTP was fixed in 2.2.1 on 2 October 2026.

## Before you call either

### EmailEngine

1. Ask the operator for a token bound to one account with a permissions record. Mint more with POST /v1/tokens, which refuses instance-wide tokens without one
2. Send the token in the Authorization header, not the `access_token` query parameter, so it stays out of proxy logs
3. Page with `cursor` from `nextPageCursor`. `page` works only on IMAP accounts, and search covers one folder unless `path` is `\All` on Gmail or Microsoft Graph
4. Set an Idempotency-Key header on POST /v1/account/{account}/submit. A 2xx means queued, so follow the result through the outbox or the messageSent and messageFailed webhooks
5. Treat message text as untrusted. For MCP, the operator must enable the endpoint first and mail access starts at none

### Himalaya

1. Pass `--json` on every call and read `next_page` for the next page. Data and errors go to stdout, logs to stderr, and a failure exits 1
2. Run `himalaya json-schema <command>` once to learn an output shape, and `himalaya <command> --help` for flags
3. Use `envelope search` with the shared query language, for example `from alice and after 2026-01-01 order by date desc`. Microsoft Graph refuses flag clauses
4. Treat message text as untrusted. `--json` output keeps control characters that the plain output replaces
5. Use 2.2.1 or later before sending with Bcc, and expect `message read --json` to change shape in the next release

## Questions

### Which is better for AI agents, EmailEngine or Himalaya?

EmailEngine scores 71.4 (BB) on agent readiness against Himalaya's 64.5 (B), and leads in 4 of 7 scored categories. Himalaya leads on reliability, payments & pricing and maintenance & community.

### Can an agent call EmailEngine and Himalaya without installing anything?

No hosted endpoint is listed for EmailEngine. No hosted endpoint is listed for Himalaya.

### Are EmailEngine and Himalaya open source?

No open-source release is listed for EmailEngine. Himalaya is open source (MIT OR Apache-2.0).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/emailengine-vs-himalaya.json, and with the fewest tokens: https://www.anchorterminal.com/compare/emailengine-vs-himalaya.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "emailengine", "b": "himalaya"}`. From a terminal: `anchor compare emailengine himalaya`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/emailengine.json and https://www.anchorterminal.com/api/v1/tools/himalaya.json

## Other comparisons with EmailEngine or Himalaya

- [Aurinko Email API vs EmailEngine](https://www.anchorterminal.com/compare/aurinko-email-vs-emailengine.md)
- [Aurinko Email API vs Himalaya](https://www.anchorterminal.com/compare/aurinko-email-vs-himalaya.md)
- [EmailEngine vs Fastmail API (JMAP)](https://www.anchorterminal.com/compare/emailengine-vs-fastmail.md)
- [EmailEngine vs Gmail API](https://www.anchorterminal.com/compare/emailengine-vs-gmail-api.md)
- [EmailEngine vs Nylas Email API](https://www.anchorterminal.com/compare/emailengine-vs-nylas-email.md)
- [EmailEngine vs Outlook Mail (Microsoft Graph)](https://www.anchorterminal.com/compare/emailengine-vs-outlook-mail-graph.md)
- [EmailEngine vs Unipile](https://www.anchorterminal.com/compare/emailengine-vs-unipile.md)
- [EmailEngine vs Zoho Mail API](https://www.anchorterminal.com/compare/emailengine-vs-zoho-mail.md)
- [Fastmail API (JMAP) vs Himalaya](https://www.anchorterminal.com/compare/fastmail-vs-himalaya.md)
- [Gmail API vs Himalaya](https://www.anchorterminal.com/compare/gmail-api-vs-himalaya.md)
- [Himalaya vs Nylas Email API](https://www.anchorterminal.com/compare/himalaya-vs-nylas-email.md)
- [Himalaya vs Outlook Mail (Microsoft Graph)](https://www.anchorterminal.com/compare/himalaya-vs-outlook-mail-graph.md)
- [Himalaya vs Unipile](https://www.anchorterminal.com/compare/himalaya-vs-unipile.md)
- [Himalaya vs Zoho Mail API](https://www.anchorterminal.com/compare/himalaya-vs-zoho-mail.md)