* Updated default timeouts
* Added support for matching IPs based on class-C (/24) address,
rather than the full IP address - enabled by default
* Added support for whitelists
* Wait for the envelope before sending tempfail (helps for some buggy MTAs)
* Removed qgreylist-info script (doesn't work with new class-C greylisting)
qgreylist is a 'lite' version of greylisting. It greylists only by
source IP address, mainly because it's written as a wrapper for
qmail-smtpd so has no other information available. For home and
small office use this works nearly as well.