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> [About blocking all mail from an ISP because some customer sent spam]
> Such an approach makes sense only if receiving one spam message is
> a bigger problem than losing a larger amount of legitimate email.
> But how do you know its only " one " I'm sure if this IP in question was
Your response shows that you have no clue about the ham:spam ratio
(I do have a clue: I've been customer for 14 years and can't remember
when I last received spam that originates from their network).
This is a technical mailing list about Postfix. There is no room
here for contributions without quantitative technical content.
>From now on there is a taboo on SORBS, just like SPF. Trespassers
will be shot.