Add source type suggestion for event forwarding

Author: ashton-huxtable

src/protocols/enforce/forward-blocked-events.md

@@ -8,6 +8,8 @@ If you're concerned about permanently discarding blocked events, you can enable
 
 Select the source you'll forward events to from the Blocked Events and Traits dropdown. Segment recommends that you create a new Source for forwarded events to avoid contaminating production data and enable blocking only when you are confident about the quality of your data.
 
+Since forwading will happen server to server, we recommend creating a [HTTP Tracking API source](https://segment.com/docs/connections/sources/catalog/libraries/server/http-api/), though any server-side source will work. 
+
 ![](../images/blocked_event_forwarding.png)
 
 > note ""