Honor your audience's consent for email open tracking

You can now decide when to track email opens. This includes: A workspace setting to track opens for everyone, everyone who doesn’t explicitly opt out, or only people who opt in. A per-contact cio_email_tracking_consent attribute you can set through the API, imports, etc; this attribute represents consent for open tracking. A hosted consent page you can link to from your emails, so recipients can grant or withdraw consent themselves.