Interesting, I misinterpreted what was being said!
I'm doubtful a default block would work, as that would even penalise the 'big boys' of email when they make basic network changes and piss off existing customers of both sender and receiver... Its easier and logical to conclude something without reputation yet is therefore sending too few mails to be useful to a spammer.
I've had good experiences with smaller ISPs (currently Mythic Beasts). In contrast, OVH was a poor experience.
I find that reputation (beyond the known "block-lists") appears more likely being tracked for the whole AS number, therefore a lot more to do with your "neighbours" than anything else.
I'm doubtful a default block would work, as that would even penalise the 'big boys' of email when they make basic network changes and piss off existing customers of both sender and receiver... Its easier and logical to conclude something without reputation yet is therefore sending too few mails to be useful to a spammer.
I've had good experiences with smaller ISPs (currently Mythic Beasts). In contrast, OVH was a poor experience.
I find that reputation (beyond the known "block-lists") appears more likely being tracked for the whole AS number, therefore a lot more to do with your "neighbours" than anything else.