Retrieve address whitelist mail settings

**This endpoint allows you to retrieve your current email address whitelist settings.** The Address Whitelist setting allows you to specify email addresses or domains for which mail should never be suppressed. For example, if you own the domain `example.com`, and one or more of your recipients use `[email protected]` addresses, placing `example.com` in the address whitelist setting instructs Twilio SendGrid to ignore all bounces, blocks, and unsubscribes logged for that domain. In other wor...