How to solve this:
We noticed one or more of your webhook endpoints is unreachable or experiencing other repeated failures. As a result, we have suspended transmission of these webhooks.
If you would like to continue to recieve webhooks batches, please ensure your target endpoint responds with a 200 HTTP status code. Once you've verified your target endpoint will receive batches, you can re-enable each webhook via the APIor in Webhooks settings in the SparkPost UI.
The following webhooks have been disabled:
IPS4 Mail Bouncer