On 24 August 2023 11:12:07 Jaroslaw Rafa via mailop <mailop@mailop.org> wrote:
If it is just a random netblock of some ISP that just happens to contain some spamming IPs (even a lot of them) inside - no, never block the netblock as a whole.
In all the years I've been running mail systems (which to my great astonishment is now greater than 25!) I've used a variety of netblock sizes and occasionally entire AS numbers in outright blocks.
In that whole time I've had precisely 1 report of a sender that was affected who had legitimate business with my employer.
One. Your network, your rules; likewise for me, right? Graeme
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