Postio — UK Address, Postcode, Email & Phone Validation

Validate UK addresses, postcodes, emails and phone numbers — Royal Mail PAF, live SMTP and HLR.

Connector by postio.co.ukOfficial · Domain verified by the MCP Registry

IndexedMITLocal (stdio)

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Install

Works with Claude Code, Codex, VS Code, Cursor, Windsurf, Claude Desktop. Read the repository before you give any tool access to your data.

npx agentmarket install connector/postio-co-uk-postcode-address-validation

Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.

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About

Validate UK addresses, postcodes, emails and phone numbers — Royal Mail PAF, live SMTP and HLR.

Reviews

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Permissions

What this server can do and what it asks for, from its tool list and install config. Checked Oct 25, 2026.

Tools: 4 read · 1 write · 0 delete · 1 not yet classified
Secrets: 1 (API keys, tokens or passwords)
Install scripts: None found
Runs as: Node.js package

Tools by what they do 6

Read from the source code; the running server may list different tools.

Read 4 · Look things up without changing anything.

postio_address_search
postio_phone_validate
postio_postcode_lookup
postio_udprn_lookup

Write 1 · Create, change, send or run things.

postio_email_validate

Not yet classified 1 · We could not tell from the name and description.

postio_connect

Secrets and settings it asks for

Secrets: values you paste in that let it act as you.

POSTIO_API_KEY

Other settings (environment variables or headers).

POSTIO_BASE_URL

Tools (6)

Read from the source code; the running server may differ. Descriptions are the server’s own words; hidden characters are shown as [U+…].

postio_address_search
Search UK addresses by free-form text — building, street, postcode, organisation, or any combination. Returns a list of suggestions, each with a UDPRN (Royal Mail's per-address ID). Pass a chosen UDPRN to `postio_udprn_lookup` to fetch the full record. Free / non-billable.
postio_connect
Free key/health probe. Returns 200 if the API key is active and the upstream search service is reachable. Useful as a smoke test or to warm the worker.
postio_email_validate
Validate an email address: syntax (RFC 5322), typo correction (gnail→gmail), classification (disposable, role, free provider), MX lookup, and live SMTP mailbox probe. Returns an aggregated `deliverability` verdict (deliverable / undeliverable / risky / unknown / invalid) plus every signal independently.
postio_phone_validate
Parse a phone number with libphonenumber and run a live HLR (Home Location Register) lookup. Returns current carrier (post-porting), original carrier, ported flag, reachability, MCC/MNC. Pass numbers in E.164 (`+447700900123`) for unambiguous results.
postio_postcode_lookup
Return every PAF delivery point at a UK postcode, ordered by building number. Whitespace and case are normalised. Billable on a hit; valid postcodes with no delivery points return an empty list and are not charged.
postio_udprn_lookup
Look up a single UK delivery point by its UDPRN (Royal Mail's stable per-address ID). Use this after `postio_address_search` to fetch the full record for a chosen suggestion. Billable on a hit; misses (404) are not charged.

Signals

Stars: 0
Forks: 0
Open issues: 0
Last commit (this folder): Oct 23, 2026 (7 days ago)
Last release: Oct 23, 2026 (7 days ago)

From GitHub (fetched Oct 24, 2026).

Details

Registry name: uk.co.postio/postcode-address-validation
Version: 0.1.5
Auth: API key
Packages: npm @postio/mcp
License: MIT
Repository: github.com/postio-uk/postio-integrations
Website: postio.co.uk/integrations/mcp
First seen: Oct 24, 2026
Last checked: Oct 24, 2026
Source: Official MCP Registry github-graphql

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Cite this page

Postio — UK Address, Postcode, Email & Phone Validation MCP server. Agent Mart. https://agentmart.dev/connectors/postio-co-uk-postcode-address-validation (last updated 2026-10-24)