David Brodbeck wrote:
make sure in writing before you sign anything that your ip(s) will never be listed by the ISP as res/dynamic/dialup ip. If they do they may be in breach of contract (and you would need a lawyer for resolution.)
I doubt any ISP would agree to a contract term like that, because they don't have any control over what the blacklist maintainers do. Some of the blacklists deliberately list whole blocks of IP addresses that happen to be on the same backbone provider as a spammer, to intentionally cause collateral damage. There's little an invididual ISP can do about that.
They can start by using proper rDNS. There's an awful lot of rDNS that looks like dynamic rDNS that contains statically-assigned addresses. The corollary to that is "hey, stupid, don't throw your static customers and servers into blocks
that are mostly dynamic." Which, believe it or not, some ISPs do. Try to get a separate allocation or sane rDNS from SBC** on a DSL line... Good luck. They do it on T-1 and other leased lines but apparently not on DSL.
You are correct to a certain extent, and there are lists like the Mail Abuse Prevention System DUL (Dialup User List) where the ISPs are asked to VOLUNTEER their lists of dynamic netblocks (although that wouldn't help in the example given above), but I believe most of the dynamic lists are based on trawling rDNS (out of necessity more than anything else).
Best, Steve
**SBC is the USA's largest telephone company.
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