Documentation

Bouncebuster verifies email addresses at the SMTP level and sorts them into five plain categories: valid, invalid, catch-all, disposable, and unknown. You can use it three ways:

REST API

Verify from any language over HTTPS.

CLI

Verify files and addresses from your terminal.

MCP server

Give AI agents a verify tool.

Quick start

Create an API key in the dashboard, then verify an address:

curl -X POST https://app.bouncebuster.io/api/v1/verify \
  -H "Authorization: Bearer bb_live_…" \
  -H "Content-Type: application/json" \
  -d '{"email":"[email protected]"}'

Billing

One credit is charged per billable result. Duplicate addresses (within a list) and unknown results are never charged. See pricing for plan limits.