Send Reject back to remote instance too

[fauno]

I was reading GTS docs about Interaction Policy and it mentions interactions should be rejected when they don't follow the policy, so I'm wondering if answering with a Reject when an actor or instance is blocked would prevent having interactions federated elsewhere.

Just leaving this as a note for further research.

Implementation could be crafting and sending a Reject activity on apsystem.ts rejectActivity() and leave at that.