Twilio SendGrid Mail Settings API

The Twilio SendGrid Mail Settings API allows you to retrieve and configure the various Mail Settings available. Mail Settings instruct SendGrid to apply specific settings to every email that you send over [SendGrids Web API](https://docs.sendgrid.com/api-reference/mail-send/v3-mail-send) or [SMTP relay](https://sendgrid.com/docs/for-developers/sending-email/building-an-x-smtpapi-header/). These settings include how to embed a custom footer, how to manage blocks, spam, and bounces, and more.