Sends a test email to the specified support address to verify that email forwarding for the address works. An external support address won't work in Zendesk Support until it's verified. **Note**: You don't need to verify Zendesk system support addresses. The endpoint takes the following body: `{"type": "forwarding"}`. The value of the `type` property defaults to "forwarding" if none is specified, but the values "spf" and "dns" are also accepted. Use this endpoint after [adding](#create-support-address) an external support address to Zendesk Support and setting up forwarding on your email server. See [Forwarding incoming email to Zendesk Support](https://support.zendesk.com/hc/en-us/articles/203663266). The endpoint doesn't return the results of the test. Instead, use the [Show Support Address](#show-support-address) endpoint to check that the `forwarding_status` property is "verified". Other verification c