# MailBridgeAPI > Connect an existing SMTP / IMAP mailbox to an email API. Developers use API keys without needing the mailbox password. This index describes public product documentation. It contains no mailbox credentials or customer data. ## Knowledge resources - [Full knowledge text](https://mailbridgeapi.com/nl/llms-full.txt): Product, pricing, security, use cases, FAQ and endpoint reference. - [Structured knowledge](https://mailbridgeapi.com/nl/knowledge.json): Articles with stable IDs, source URLs and revision hashes. - [Revision manifest](https://mailbridgeapi.com/nl/knowledge/manifest.json): Last update and available resources. - [Search API](https://mailbridgeapi.com/api/knowledge?lang=nl): Read-only search and article retrieval. - [OpenAPI schema](https://mailbridgeapi.com/nl/knowledge/openapi.json): Knowledge API contract. - [Function tools](https://mailbridgeapi.com/nl/knowledge/tools.json): Definitions for an assistant application. ## Website - [Product](https://mailbridgeapi.com/nl/services/) - [Use cases](https://mailbridgeapi.com/nl/use-cases/) - [Pricing](https://mailbridgeapi.com/nl/pricing/) - [Email API reference](https://mailbridgeapi.com/nl/doc/) - [SMSMobileAPI](https://mailbridgeapi.com/nl/smsmobileapi/): APPHUBIC LTD mobile phone, SMS and call API service. - [Contact](https://mailbridgeapi.com/nl/contact/)