### SMTP.com API Documentation

Source: https://www.smtp.com/resources/api-documentation/index

Provides access to the comprehensive API documentation for SMTP.com services. This includes details on endpoints, methods, parameters, and usage examples for integrating SMTP services into your applications.

```APIDOC
API documentation:
  URL: https://www.smtp.com/resources/api-documentation/
  Description: Comprehensive documentation for SMTP.com's API, covering all available endpoints and functionalities for email sending and management.
```

--------------------------------

### SMTP.com API v4 Authentication Methods

Source: https://www.smtp.com/resources/api-documentation/index

Explains the various ways to authenticate with the SMTP.com API v4 using an API key, including URL, Header, Bearer Token Header, Custom HTTP Header, and Query String methods.

```APIDOC
Authentication
SMTP.com API users can authenticate a variety of ways using their specific API key. Supported authentication methods include:
**URL:**`https://api:{apikey}@api.smtp.com/v4`
**Header:**`Authorization: Basic base64(api:{apikey})`
**Bearer Token Header:**`Authorization: Bearer {apikey}`
**Custom HTTP Header:**`X-SMTPCOM-API: {apikey}`
**Query String:**`https://api.smtp.com/v4?api_key={apikey}`
```

--------------------------------

### SMTP.com API v4 Documentation

Source: https://www.smtp.com/resources/api-documentation/index

Details the SMTP.com API v4, a RESTful JSON-formatted API. It specifies the required `Accept` header for JSON requests and outlines the JSend specification for API responses.

```APIDOC
SMTP.com API v4 documentation
The SMTP.com API v4 is a RESTful (but not HATEOAS) JSON formatted API.
JSON is generally the required format for request data unless explicitly stated otherwise and must be accompanied by the corresponding HTTP header:
```
Accept: application/json
```
The SMTP.com API v4 responses are returned in JSON according to the JSend specification as it relates to JSON formatted API responses. For information see [the official JSend specification (opens in a new tab)](https://github.com/omniti-labs/jsend).
```

--------------------------------

### Contact Us Form

Source: https://www.smtp.com/resources/api-documentation/index

Details the fields and functionality of the 'Contact Us' form on SMTP.com. This form is used for sales inquiries and requires Name, Email, and a Message. It also mentions data processing according to the Privacy Policy.

```APIDOC
Contact Us Form:
  Purpose: Sales inquiries.
  Fields:
    - Name (Required): User's name.
    - Email (Required): User's email address.
    - Leave us a message (Required): User's message content.
  Notes:
    - Support team cannot be reached through this form.
    - Submission implies agreement with the Privacy Policy.
    - Indicates required fields with an asterisk (*).
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.