Luca Bertoncello wrote: >>You put a deny in your rcpt acl based on a dnsbl lookup,
>>using a dnsbl which specialises in listing dynamic and
>>generic IP addresses.
>
>
> This is my idea too...
> But (next question!): where can I find this list?
SORBS DUHL is one: http://www.nl.sorbs.net/faq/dul.shtml but there are many; have you considered asking google
for "DNSBL" ? Have you considered monitoring relevant
Usenet groups for information?