Repeated Blacklisting / IP reputation

[jason at i6ix.com (Jason Bertoch)]

Suresh Ramasubramanian wrote:
> That said most of the larger players already attend MAAWG - that
> leaves rural ISPs, small universities, corporate mailservers etc etc
> that dont have full time postmasters, and where you're more likely to
> run into this issue.
>   
I've found the opposite to hold true more often.  Smaller organizations 
can use public blacklists for free, due to their low volume, and so have 
little incentive to run their own local blacklist.  I've typically seen 
the larger organizations run their own blacklists and are much more 
difficult to contact for removal.