# Reserved Names Some form values are reserved for our backend to process. For example, the "apiKey" value is reserved for your access key, and is not actually emailed to you. | Name | Type | Description | | --------------------- | ------ | --------------------------------------------------------------------------------------------------------------------------- | | apiKey (**required**) | string | This is required for your form to be submitted to your email address. | | subject | string | This is the email subject that will be sent to you. This can be decided by the user, or pre-set via the 'hidden' attribute. | | redirect | string | This is a customizable URL that the user is redirected to after the form submission. | | attachment | file | **PREMIUM FEATURE:** Receive files | | webhook | string | **PREMIUM FEATURE:** URL where form webhook is sent. See Webhook section for more information. | --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.maketheform.com/getting-started/reserved-names.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.