# Cloudflare Email Service vs Zoho CPaaS (formerly ZeptoMail)

> Cloudflare Email Service scores 67.3 (B) on agent readiness against Zoho CPaaS (formerly ZeptoMail)'s 61.8 (C), and leads in 5 of 7 scored categories. Zoho CPaaS (formerly ZeptoMail) leads on payments & pricing and transparency & trust. Both do email send. Category scores…

- Canonical: https://www.anchorterminal.com/compare/cloudflare-email-service-vs-zoho-zeptomail
- Markdown: https://www.anchorterminal.com/compare/cloudflare-email-service-vs-zoho-zeptomail.md (~2,950 tokens)
- Slim: https://www.anchorterminal.com/compare/cloudflare-email-service-vs-zoho-zeptomail.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/cloudflare-email-service-vs-zoho-zeptomail.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: 2026-10-08

Cloudflare Email Service scores 67.3 (B) on agent readiness against Zoho CPaaS (formerly ZeptoMail)'s 61.8 (C), and leads in 5 of 7 scored categories. Zoho CPaaS (formerly ZeptoMail) leads on payments & pricing and transparency & trust. Both do email send.

- Cloudflare Email Service: grade B, 67.3/100, rank #212 of 722. Markdown https://www.anchorterminal.com/tools/cloudflare-email-service.md · JSON https://www.anchorterminal.com/api/v1/tools/cloudflare-email-service.json
- Zoho CPaaS (formerly ZeptoMail): grade C, 61.8/100, rank #356 of 722. Markdown https://www.anchorterminal.com/tools/zoho-zeptomail.md · JSON https://www.anchorterminal.com/api/v1/tools/zoho-zeptomail.json

## Which one, for what

### Cloudflare Email Service (B)

Good for: Teams already on Cloudflare DNS and Workers that want transactional sending and inbound handling in one account at a low unit price.

Ahead on:
- Reliability, 51 against 41
- Schema & documentation, 89 against 78
- Agent ergonomics, 72 against 55
- Maintenance & community, 81 against 74

Watch for: Email Sending has been in public beta since 16 April 2026. Cloudflare's terms let it remove a beta service at any time, and no SLA was found

### Zoho CPaaS (formerly ZeptoMail) (C)

Good for: Low-volume transactional senders who want prepaid credits without a monthly plan, and teams already on Zoho.

Ahead on:
- Payments & pricing, 40 against 30
- Transparency & trust, 82 against 76

Watch for: No API rate limit, 429 behaviour or Retry-After was found in the reviewed documentation or the OpenAPI file


## Score by category

| Category | Weight | Cloudflare Email Service | Zoho CPaaS (formerly ZeptoMail) | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 51 | 41 | Cloudflare Email Service +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 89 | 78 | Cloudflare Email Service +11 |
| Agent ergonomics | 13% (16.2 this run) | 72 | 55 | Cloudflare Email Service +17 |
| Security & auth | 14% (17.5 this run) | 77 | 76 | Cloudflare Email Service +1 |
| Payments & pricing | 10% (12.5 this run) | 30 | 40 | Zoho CPaaS (formerly ZeptoMail) +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 81 | 74 | Cloudflare Email Service +7 |
| Transparency & trust | 7% (8.8 this run) | 76 | 82 | Zoho CPaaS (formerly ZeptoMail) +6 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **67.3 · B** | **61.8 · C** | |

## Facts side by side

| Fact | Cloudflare Email Service | Zoho CPaaS (formerly ZeptoMail) |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Cloudflare | Zoho Corporation |
| Hosted endpoint | `https://api.cloudflare.com/client/v4` | `https://cpaas.zoho.com/v1.1` |
| Transports | HTTP | HTTP |
| Auth | API key | OAuth or key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | Proprietary service under Cloudflare's Self-Serve Subscription Agreement and Developer Platform service-specific terms. The official `cloudflare` SDK on npm is Apache-2.0 | Proprietary service under the Zoho CPaaS terms of use. The Node SDK on npm is MIT |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-09-25 | none |
| Terms last updated | 2025-09-12 | no date given |
| Privacy policy last updated | no date given | 2025-12-22 |
| Customer content may train models | not found in the text | yes |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | 3.8M npm/wk, 364k PyPI/wk | 40k npm/wk |

## Verdicts

**Cloudflare Email Service.** Cloudflare API tokens can be limited to sending, given an expiry and restricted by IP address, and a public OpenAPI file covers 29 Email Sending operations. Sending is still in beta, with no SLA, no idempotency key and no published daily quota, and it needs a domain on Cloudflare DNS and the Workers Paid plan.

**Zoho CPaaS (formerly ZeptoMail).** A public OpenAPI 3.0 file covers all 42 operations, and each Agent has its own send-only key. Email costs $2.50 per 10,000 with the first credit free. No API rate limit, 429 handling, idempotency key or SLA was found in the reviewed documentation, and new accounts wait for a manual review.

## Before you call either

### Cloudflare Email Service

1. POST to `https://api.cloudflare.com/client/v4/accounts/{account_id}/email/sending/send` with `Authorization: Bearer <token>`. The body needs `to`, `from`, `subject` and one of `html` or `text`
2. Don't retry a timed-out send blindly. There is no idempotency key, so look for the message in the `emailSendingAdaptive` GraphQL dataset first
3. On 429 (code 10004) wait for the `retry-after` header. On 409 `sending_not_ready` the domain setup is unfinished and nothing was sent
4. Read `result.delivered`, `result.queued` and `result.permanent_bounces` in the response. A 200 does not mean every recipient was accepted
5. Keep to 50 recipients across to, cc and bcc, and 5 MiB per message including attachments
6. For SMTP use `smtp.mx.cloudflare.net` on port 465 with implicit TLS, username `api_token` and the API token as password. Port 587 is not supported
7. By default one suppressed recipient fails the whole send. Turn on Drop suppressed recipients for the domain to send to the rest

### Zoho CPaaS (formerly ZeptoMail)

1. Call the base URL for the account's region (cpaas.zoho.com, .eu, .in, .com.au, .jp or .com.cn). A key from one region fails on another
2. Send with `Authorization: Zoho-enczapikey <key>`. Logs, domains, templates, agents and suppressions need a Zoho OAuth token as `Authorization: Zoho-oauthtoken <token>`
3. Post OAuth client secrets and refresh tokens in the request body, not the query string the guide shows, so they stay out of logs
4. Don't retry a timed-out send blindly. There is no idempotency key, so look the message up by `client_reference` in the email logs first
5. Count one email per recipient, including cc and bcc, and keep each address field to 500 entries and each attachment to 15 MB
6. Use a sandbox Agent for tests. It accepts up to 10,000 emails a day and sends none of them

## Questions

### Which is better for AI agents, Cloudflare Email Service or Zoho CPaaS (formerly ZeptoMail)?

Cloudflare Email Service scores 67.3 (B) on agent readiness against Zoho CPaaS (formerly ZeptoMail)'s 61.8 (C), and leads in 5 of 7 scored categories. Zoho CPaaS (formerly ZeptoMail) leads on payments & pricing and transparency & trust.

### Do Cloudflare Email Service and Zoho CPaaS (formerly ZeptoMail) need an API key?

Cloudflare Email Service needs an API key. Zoho CPaaS (formerly ZeptoMail) takes an API key or an OAuth sign-in.

### Can an agent call Cloudflare Email Service and Zoho CPaaS (formerly ZeptoMail) without installing anything?

Yes. Cloudflare Email Service has a hosted endpoint at https://api.cloudflare.com/client/v4 and Zoho CPaaS (formerly ZeptoMail) at https://cpaas.zoho.com/v1.1.


## For agents

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

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