Head to head · Agent inboxes · October 2026 research run

Hostinger Agentic Mail vs Postfleet

Hostinger Agentic Mail scores 60.1 (C) on agent readiness against Postfleet's 57.4 (C), and leads in 6 of 7 scored categories. Postfleet leads on payments & pricing. Both do agent inboxes.

Best email inbox APIs for AI agents · All 66 inboxes comparisons

Which one, for what

Hostinger Agentic Mail C

Best for A low-cost real mailbox on the agent's own domain with IMAP-style operations.

Ahead on

  • Reliability, 42 against 35
  • Transparency & trust, 62 against 34

Watch for

No idempotency key on send, and the docs give no retry guidance beyond waiting after 429

Postfleet C

Best for A developer whose agent reads mail from strangers and should only see screened text, with server-side approval before sends.

Ahead on

  • Payments & pricing, 30 against 10

Also in its favour

  • Runs on your own machine
  • Free to start without a card

Watch for

No operator, address or governing law named in the terms or privacy policy

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.

Transparency & trust Hostinger Agentic Mail +28

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.

Postfleet 34

The service is closed. The MCP server and SDK are MIT on npm, but the terms name no company, address or governing law, so a customer can't tell who they contract with (10 of 30). The privacy policy and terms agree on retention (original 7 days, cleaned mail 90 days, webhook payloads 7 days, signup IP 30 days), say mail isn't used for training, and disclose Google Analytics, Microsoft Clarity and an OpenAI ads pixel with a server-side signup event carrying a hashed email. The DPA is on request only, returned within 60 days (20 of 30). No deprecation policy or dated notices; the terms change when the page changes (0 of 20). The privacy policy names no processors or regions and says it doesn't claim EU residency; the docs name AWS SES, Resend and Claude Haiku in passing (6 of 20).

Payments & pricing Postfleet +20

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.

Postfleet 30

No x402, MPP or L402 in the docs or the OpenAPI file (0 of 40). Four plans with public prices and limits, but no per-message metered price (10). Free has no card, with 100 comprehended messages, 3 mailboxes and 3,000 sends a month (20). A person has to sign up and create keys in the dashboard. The homepage says the agent provisions its own address with no account page, which is true of mailboxes once a key exists, but not of the key. The demo inbox needs no signup but is a demo under /api/demo, not API access (0 of 20).

Reliability Hostinger Agentic Mail +7

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.

Postfleet 35

Graded with the hosted lines, on the REST API with the MCP server noted. No status page found. /status still answered 404 on 4 November and none is linked (0). No readable incident history (5). Sending limits are published with numbers (holds at 20 attempts a minute and 100 an hour, Free at 100 sends a day and 3,000 a month, monthly quotas per plan), but read limits aren't, Free's new-recipient limit has no number and the comprehend route's hourly cap is unstated (10 of 15). Sends take a client_id with a full replay table, errors carry retryable, and the docs say which outcomes to retry with the same key and which need a new one. API 429s document no Retry-After or reset time (10 of 15). No SLA found on any plan (0). Nothing on the site calls the API or MCP server beta or preview, though both packages are 0.x (10).

Score by category

CategoryWeight this runHostinger Agentic MailPostfleetEdge
Reliability16%204235Hostinger Agentic Mail +7
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28483Hostinger Agentic Mail +1
Agent ergonomics13%16.27672Hostinger Agentic Mail +4
Security & auth14%17.57068Hostinger Agentic Mail +2
Payments & pricing10%12.51030Postfleet +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87775Hostinger Agentic Mail +2
Transparency & trust7%8.86234Hostinger Agentic Mail +28
Negative events≤1500
TotalC 60.1/100C 57.4/100

Facts side by side

FactHostinger Agentic MailPostfleet
KindHTTP APIHTTP API
VendorHostinger International LimitedPostfleet
Hosted endpointhttps://mcp.mail.hostinger.com/mcphttps://api.postfleet.ai/api/v1
TransportsHTTP, Streamable HTTPHTTP, Streamable HTTP, stdio
AuthAPI keyAPI key
PricingPaidFreemium
x402nono
LicencenoneProprietary hosted service under Postfleet's terms (effective 6 October 2026), which name no company or governing law. The MCP server package @postfleet/mcp and the TypeScript SDK postfleet are MIT on npm; the GitHub repository is a mirror of the MCP server only
Tools exposednone16
Read-only variant documentednono
llms.txtyesyes
MCP registrynot listedai.postfleet/postfleet
Last release2026-11-032026-09-08
Terms last updated2026-09-292026-10-06
Privacy policy last updated2026-10-142026-10-06
Customer content may train modelsyesnot found in the text
Terms restrict automated accessyesnot found in the text
Terms restrict benchmarkingnot found in the textnot found in the text
Terms or service can change without noticeyesnot found in the text
Arbitration or class-action waivernot found in the textnot found in the text
Popularity1.8k npm/wk0 stars

How the scores have moved

Verdicts

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.

Postfleet

Agent mailboxes over REST, webhooks and a 16-tool MCP server, with mailbox-bound keys, required idempotency keys on MCP sends, server-side approval and documented screening that keeps raw mail out of MCP reads. The screening is the vendor's claim, untested by us. Under four months old, it names no operator and has no status page, changelog or security contact.

Before you call either

Hostinger Agentic Mail

  1. Call GET /api/v1/me first to get the mailbox resource IDs the token can reach
  2. Ask the owner to set an outgoing allow list before letting an agent send unattended
  3. Check the Sent folder before retrying a send, since sends have no idempotency key
  4. Read message text with the text-content endpoint, which doesn't mark the message as seen
  5. Back off on 429; repeated limit hits can block your IP address for a while

Postfleet

  1. Check comprehension.status before acting; skipped_injection_risk mail still arrives as cleaned text and must be handled as untrusted data.
  2. Treat a 202 pending_approval from send_email, reply_email or send_draft as success and never retry it; follow up with list_drafts.
  3. Reuse the same client_id when retrying a send, and use a new one after a terminal 402, 403 hold or permanent 400.
  4. Call list_mailboxes before create_mailbox; each create makes another mailbox and retries are not idempotent.
  5. Give a reading agent a mailbox-bound key with can_send false, and keep the account-wide key outside the worker.

Questions

Which is better for AI agents, Hostinger Agentic Mail or Postfleet?

Hostinger Agentic Mail scores 60.1 (C) on agent readiness against Postfleet's 57.4 (C), and leads in 6 of 7 scored categories. Postfleet leads on payments & pricing.

Do Hostinger Agentic Mail and Postfleet need an API key?

Both need an API key.

Can an agent call Hostinger Agentic Mail and Postfleet without installing anything?

Yes. Hostinger Agentic Mail has a hosted endpoint at https://mcp.mail.hostinger.com/mcp and Postfleet at https://api.postfleet.ai/api/v1.

Other comparisons with Hostinger Agentic Mail or Postfleet

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