Rebuild Postfix - "rDNS Check" selects "Reject Unknown Hostname"

Hi,

Is this a bug or am I doing some daft.

Ticking "Drop all emails if no rDNS/PTR" in "Rebuild Postfix Configuration" seems to also select "Reject unless the hostname has valid DNS record" as the emails stop sending and the error in mail.log shows "Reject Unknown Hostname".

Anyone else have this?

Regards Lee.