>> Sure... What's the ratio? 1:100000 (ham:spam)?
>
>I don't know, because I don't have statistics on how much of my mail comes
>from dynamically-addressed hosts. And if you block mail from
>dynamically-addressed hosts, *you don't know either*.
I dump the mail from addresses on the dynamic DNSBLS (MAPS and
Spamhaus) into a spamtrap. It sees about 50,000 messages a day, and
get somewhere between one misfire a week and one misfire a month.
People who reject on DNSBLs do get some feedback when people complain
about their rejected mail, and complaints on that score are quite rare
so long as you're blocking actual dynamic addresses and not using
incompetent substitutes like SORBS that block stuff that "looks like"
dynamic.
There was an era when it wasn't reasonable to reject all mail from
dynamic addresses, but that era was over several years ago. If your
ISP is incompetent, you have my sympathy, but that's your problem, not
mine.
R's,
John
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