[orbz]

They’ll often check the referrer or other information in the request to determine whether they should attempt the scam or redirect to an innocuous site to confound people investigating the scam.

[dbtc]

Ah, thanks.

I was hoping to send in a few (randomly generated) credit card numbers.

I did that with the simpler version from before; the posts were received anyway, though I don't know what happened beyond that.