Am 18.04.2024 schrieb Bill Cole via mailop <mailop@mailop.org>:

> I can't say that Spamhaus lists IPs that engage in the abusive
> practice of remote sender verification but I would be happy to hear
> that they are doing so and CSS+XBL listing is a reasonable expression
> of that sort of world-hostile behavior.

If that sender verification includes trying to send an email until
RCPT TO:, this is abusive in many cases and also uceprotect will list
such servers.
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