## mailfront

# Plugin: cvm-authenticate

This plugin uses a CVM to validate recipient addresses.

## Configuration

This module is configured by the CVM SASL library.

Additionally, it recognizes the following environment variable:

`$AUTH_REQUIRES_TLS`
  Only offer authentication when the client is using an encrypted connection, to avoid sending a password over an insecure connection. This checks that TLS has been negotiated by the starttls-ucspi plugin.

## Commands

`AUTH`
  Implements the SMTP service extension for authentication, as specified by RFC 2554.

## Sender Action

None

## Recipient Action

None

## Data Action

None

## Message Action

None