Postio — UK Address, Postcode, Email & Phone Validation MCP Server
Postio — UK Address, Postcode, Email & Phone Validation runs on your own machine — the client starts it, so there is no endpoint to ping. 20 installs a week from npm. Last commit 6 Oct 2026.
Validate UK addresses, postcodes, emails and phone numbers — Royal Mail PAF, live SMTP and HLR.
Nothing serious here today
Today is the operative word: we check Postio — UK Address, Postcode, Email & Phone Validation every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
Connect this server
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add postcode-address-validation -- npx -y @postio/mcp{
"mcpServers": {
"postcode-address-validation": {
"args": [
"-y",
"@postio/mcp"
],
"command": "npx"
}
}
}[mcp_servers.postcode-address-validation]
command = "npx"
args = ["-y", "@postio/mcp"]{
"mcpServers": {
"postcode-address-validation": {
"args": [
"-y",
"@postio/mcp"
],
"command": "npx"
}
}
}{
"mcpServers": {
"postcode-address-validation": {
"args": [
"-y",
"@postio/mcp"
],
"command": "npx"
}
}
}This one needs environment variables set before it will start:
POSTIO_API_KEY (Postio API key (pk_…). Free key, first 100 lookups on us, no card: https://postio.co.uk/signup), POSTIO_BASE_URL (Override the API base URL. Defaults to https://api.postio.co.uk. Only needed for staging.).
The author declared them in the registry entry; get the values from the project itself.
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Postio — UK Address, Postcode, Email & Phone Validation — questions
Answers built from our own checks of this server.