That would make not-refunding culturally crass unless it was warranted.

With manual options for:

0. (Default, refund)

1. (Default refund) + Auto-send discouragement response. (But allow it.)

2. (Default refund) + Block.

3. Do not refund

4. Do not refund + Auto-send discouragement response.

5. Do not refund + Block.

6. Do not refund + Block + Report SPAM (Boom!)

And typically use $1 fee, to discourage spam.

And $10 fee, for important, open, but high frequency addresses, as that covers the cost of reviewing high throughput email, so useful email did get identified and reviewed. (With the low quality communication subsidizing the high quality communication.)

The latter would be very useful in enabling in-demand contact doors to remain completely open, without being overwhelmed. Think of a CEO or other well known person, who does want an open channel of feedback from anyone, ideally, but is going to have to have someone vet feedback for the most impactful comments, and summarize any important trend in the rest. $10 strongly disincentives low quality communication, and covers the cost of getting value out of communication (for everyone).