I admit "C" is fairly clearly explained... (Sorry)
Your clarification on "B" was helpful (Thanks)
While I suspect that the answer to "A" might be documented somewhere, by any chance, would you mind either confirming or giving me a pointer to the correct FAQ answer?
If, for example, tiscali.co.uk were to change their mailserver configuration, would I need to re-configure my mailhosts in SpamCop, or will this be automatically detected from the DNS?