Head to head · Agent inboxes · October 2026 research run
Clawpost vs Hostinger Agentic Mail
Hostinger Agentic Mail scores 60.1 (C) on agent readiness against Clawpost's 36.8 (F), and leads in 6 of 7 scored categories. Clawpost leads on payments & pricing. Both do agent inboxes.
Best email inbox APIs for AI agents · All 66 inboxes comparisons
Which one, for what
Clawpost F
Best for A developer who wants an agent inbox on their own domain and Cloudflare account with a default approval gate.
Ahead on
- Payments & pricing, 60 against 10
Also in its favour
- Open source
Watch for
One shared API key grants every REST and MCP operation; no scopes or read-only key
Best for A low-cost real mailbox on the agent's own domain with IMAP-style operations.
Ahead on
- Reliability, 42 against 8
- Schema & documentation, 84 against 54
- Agent ergonomics, 76 against 53
- Security & auth, 70 against 42
- Maintenance & community, 77 against 2
- Transparency & trust, 62 against 32
Also in its favour
- A hosted endpoint, with nothing to install
Watch for
No idempotency key on send, and the docs give no retry guidance beyond waiting after 429
Why the edge
Each category where one leads by five points or more, with the reason behind each side's score from its assessment. The numbers are in the table below; this is what they stand for.
Maintenance & community Hostinger Agentic Mail +75
Clawpost 2
The last commit was on 1 April 2026, 219 days before this check (0). No releases or commits in the 90 days from 8 August (0). Issue and pull request activity couldn't be read through GitHub's API that day (0, unchecked). Not in the official MCP registry and no published package (0). Dependencies such as agents ^0.0.74 and the MCP SDK ^1.12.1 date from early 2026, and there's no CI (2 of 10). Total 2.
Hostinger Agentic Mail 77
hostinger-mail-api-sdk 1.19.8 was published on 3 November 2026 (30). 13 SDK releases in the 90 days from 8 August by npm's records, and docs pages updated on 27 October (20). 24/7 support, a feedback endpoint the API and MCP server expose for agents, but no changelog (10 of 15). The mail MCP server isn't in the official MCP registry (the Hostinger entry there is the hosting connector). The SDKs are current (10 of 15). MIT SDKs generated from the spec, CI not read (7 of 10). Total 77.
Payments & pricing Clawpost +50
Clawpost 60
Free self-hosted software with nothing to buy from the author, which the rubric scores 20 + 20 + 20. Running it needs the deployer's own Cloudflare Workers Paid plan at $5 a month, which isn't Clawpost's charge. No payment protocol (0 of 40). Total 60.
Hostinger Agentic Mail 10
No x402, MPP or L402 (0). Prices are public per mailbox per month, with the lowest only on 48-month prepaid terms (10 of 20). No free plan; a 30-day money-back guarantee after paying (0). Mailboxes and tokens are bought and created in hPanel by a person (0). Total 10.
Reliability Hostinger Agentic Mail +34
Clawpost 8
Graded with the lines for self-hosted software, since each deployer runs their own Worker. No published package; it deploys from the repository with a Deploy to Cloudflare button, Bun and Wrangler, and states the Cloudflare products it needs (8 of 20). No CI workflow or test suite in the repository (0). Open issues couldn't be read, because GitHub's API refused our requests for its rate limit, so the line scores absent (0, unchecked). No tags, releases or changelog; package.json says 0.1.0 (0). Pre-1.0 (0). Total 8.
Hostinger Agentic Mail 42
Graded with the hosted lines. Hostinger's Statuspage at statuspage.hostinger.com has components for Hostinger Mail SMTP inbound and outbound, IMAP and POP3, webmail and backups, but none for the Mail API or the MCP server (14 of 20). The status host's robots.txt disallows /api/ and the history page loads by script, so only the front page's 15 days (23 October to 6 November) were read, with one Outgoing Emails Service Degraded Performance incident; the longer record wasn't read, a limit of our reading (10 of 30). No request rate numbers; daily sending limits per mailbox are published, 1,000 on Starter and 3,000 on Standard and Premium (5 of 15). The docs say to wait after a 429 and warn that repeated hits can block the IP, with no Retry-After or idempotency on send (3 of 15). No SLA for email found (0). No beta label (10). Total 42.
Schema & documentation Hostinger Agentic Mail +30
Clawpost 54
All 21 MCP tools take typed zod inputs, which the MCP SDK publishes as JSON Schema (25). SKILL.md and AGENTS.md give agent-readable setup in Markdown; no llms.txt (5 of 10). Descriptions are one line each, such as Send an email, with parameter descriptions but no when-not-to-use (8 of 20). Inputs are typed with defaults for limit and offset, but recipients are a comma-separated string and direction isn't an enum in the schema read (9 of 15). The README has request examples and a REST route table; error responses aren't documented (7 of 15). No versioning or changelog (0). Total 54.
Hostinger Agentic Mail 84
OpenAPI 3.0 at api.mail.hostinger.com/openapi/openapi.json, version 1.3.0, with 28 operations on 20 paths, none without a description (25). docs.hostinger.com serves llms.txt and a Markdown copy of each page (10). Descriptions say what each call does and side effects, such as text and source reads not changing the seen flag and list pointing to search for filters (16 of 20). Typed parameters and bodies with required fields (12 of 15). Every operation documents 401, 403, 500 and 502, 22 document 422, with a shared error shape and a stable code (14 of 15). Version in the path and the spec, but no changelog was found (7 of 15). Total 84.
Transparency & trust Hostinger Agentic Mail +30
Clawpost 32
The README and SKILL.md say MIT, but no LICENSE file is committed (20 of 30). Self-hosted; the README says mail is stored in the deployer's D1 database with attachments in R2 and sent through Cloudflare Email Service or Resend. No retention or deletion guidance (15 of 30). No deprecation policy (0). No telemetry in the source read; the only outbound calls are to the configured mail provider, Cloudflare's API and the deployer's own webhooks (15 of 20). Total 50.
Hostinger Agentic Mail 62
Closed service under Hostinger's universal terms, which name Hostinger International Limited in Cyprus. The SDKs are MIT (18 of 30). The privacy policy covers email data and says imported mail isn't used to train non-personalised models and is deleted after termination under the service terms and DPA; retention periods for mailbox content weren't found (20 of 30). No deprecation policy or dated notices for the Mail API (0). Sub-processors and data locations for Hostinger Email weren't checked (0, unchecked). Total 38.
Security & auth Hostinger Agentic Mail +28
Clawpost 42
One shared secret for REST and MCP, compared in constant time, with no scopes, expiry or per-client keys (10 of 30). Sender approval, drafts, and an optional allowlist of domains for routing changes limit what an agent can see and change; the key can still send to anyone (14 of 20). Mail from unapproved senders is hidden from all query tools by default, and list_pending returns metadata without bodies, documented as a prompt-injection guard (15). No log of API or tool calls beyond the stored messages (3 of 15). No security policy, advisories or disclosure route for this personal project (0). Total 42.
Hostinger Agentic Mail 70
Named tokens scoped to one order and to all or selected mailboxes, with separate SMTP/IMAP and webhook-management permissions, shown once and revocable one by one. The MCP server advertises protected-resource metadata on its 401 but documents bearer tokens only (25 of 30). Outgoing allow and block lists, with the block list winning, and mailbox-level scoping. Deletes are permanent and no read-only permission was named (14 of 20). Inbound mail is untrusted content; the docs advise the allow list for autonomous agents but give no prompt-injection guidance for message content (6 of 15). Email Logs record delivery statuses, sign-in attempts per protocol and an audit trail of mailbox setting changes, and webhooks show the last 20 deliveries (10 of 15). A valid security.txt, a HackerOne bug bounty and a responsible disclosure policy; no certification was checked (15 of 20). Total 70.
Score by category
| Category | Weight this run | Clawpost | Hostinger Agentic Mail | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 8 | 42 | Hostinger Agentic Mail +34 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 54 | 84 | Hostinger Agentic Mail +30 |
| Agent ergonomics | 13%16.2 | 53 | 76 | Hostinger Agentic Mail +23 |
| Security & auth | 14%17.5 | 42 | 70 | Hostinger Agentic Mail +28 |
| Payments & pricing | 10%12.5 | 60 | 10 | Clawpost +50 |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 2 | 77 | Hostinger Agentic Mail +75 |
| Transparency & trust | 7%8.8 | 32 | 62 | Hostinger Agentic Mail +30 |
| Negative events | ≤15 | 0 | 0 | |
| Total | F 36.8/100 | C 60.1/100 |
Facts side by side
| Fact | Clawpost | Hostinger Agentic Mail |
|---|---|---|
| Kind | MCP server | HTTP API |
| Vendor | Frank Harris | Hostinger International Limited |
| Hosted endpoint | no (local only) | https://mcp.mail.hostinger.com/mcp |
| Transports | Streamable HTTP, HTTP | HTTP, Streamable HTTP |
| Auth | API key | API key |
| Pricing | Free | Paid |
| x402 | no | no |
| Licence | MIT | none |
| Tools exposed | 21 | none |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | 2026-04-01 | 2026-11-03 |
| Terms last updated | no document linked | 2026-09-29 |
| Privacy policy last updated | no document linked | 2026-10-14 |
| Customer content may train models | not read yet | yes |
| Terms restrict automated access | not read yet | yes |
| Terms restrict benchmarking | not read yet | not found in the text |
| Terms or service can change without notice | not read yet | yes |
| Arbitration or class-action waiver | not read yet | not found in the text |
| Popularity | none | 1.8k npm/wk |
Verdicts
Clawpost
A small self-hosted agent inbox whose sender-approval gate keeps unknown senders' mail away from the agent by default, with drafts for human review. It is one developer's project, unchanged since 1 April 2026, with one all-powerful key, no releases, tests or CI.
Hostinger Agentic Mail
A real mailbox behind a typed API, with order- and mailbox-scoped tokens, outgoing allow lists, a remote MCP server and SDKs in three languages. Sends take no idempotency key, request limits have no numbers, and there is no free plan; every mailbox is bought in hPanel on a long prepaid term.
Before you call either
Clawpost
- Expect unknown senders' mail to be invisible until
approve_senderruns; checklist_pendingfor metadata first - Use
create_draftinstead ofsend_emailwhen a person should review the message - Send to one address per call or comma-separate recipients in
to; a retried send isn't deduplicated - Treat the deployer's Worker URL and
CLAWPOST_API_KEYas full access to the mailbox
Hostinger Agentic Mail
- Call
GET /api/v1/mefirst to get the mailbox resource IDs the token can reach - Ask the owner to set an outgoing allow list before letting an agent send unattended
- Check the Sent folder before retrying a send, since sends have no idempotency key
- Read message text with the text-content endpoint, which doesn't mark the message as seen
- Back off on 429; repeated limit hits can block your IP address for a while
Questions
Which is better for AI agents, Clawpost or Hostinger Agentic Mail?
Hostinger Agentic Mail scores 60.1 (C) on agent readiness against Clawpost's 36.8 (F), and leads in 6 of 7 scored categories. Clawpost leads on payments & pricing.
Do Clawpost and Hostinger Agentic Mail need an API key?
Both need an API key.
Can an agent call Clawpost and Hostinger Agentic Mail without installing anything?
No hosted endpoint is listed for Clawpost. Hostinger Agentic Mail has a hosted endpoint at https://mcp.mail.hostinger.com/mcp.
Are Clawpost and Hostinger Agentic Mail open source?
Clawpost is open source (MIT). No open-source release is listed for Hostinger Agentic Mail.
Other comparisons with Clawpost or Hostinger Agentic Mail
- AgentMail API + MCP vs Clawpost
- AgentMail API + MCP vs Hostinger Agentic Mail
- Cherami vs Clawpost
- Cherami vs Hostinger Agentic Mail
- Clawpost vs Inbound
- Clawpost vs InboxAPI
- Clawpost vs Lumbox
- Clawpost vs Mailows
- Clawpost vs mails.ai Agent Email
- Clawpost vs MailSlurp
- Clawpost vs Postfleet
- Clawpost vs Robotomail
- Hostinger Agentic Mail vs Inbound
- Hostinger Agentic Mail vs InboxAPI
- Hostinger Agentic Mail vs Lumbox
- Hostinger Agentic Mail vs Mailows
- Hostinger Agentic Mail vs mails.ai Agent Email
- Hostinger Agentic Mail vs MailSlurp
- Hostinger Agentic Mail vs Postfleet
- Hostinger Agentic Mail vs Robotomail
Machine-readable
- This page as Markdown
/compare/clawpost-vs-hostinger-agentic-mail.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/clawpost.json·/api/v1/tools/hostinger-agentic-mail.json - From a terminal
anchor compare clawpost hostinger-agentic-mail(the CLI) - Over MCP
compare_tools {"a": "clawpost", "b": "hostinger-agentic-mail"}at/mcp, no key