Hailstorm spam is sent in very high intensities from many IP addresses in a brief period before disappearing and then using a different set of IP addresses.
This technique is used to evade anti-spam mechanisms that are not fast enough to react as the campaigns are short.
The Abusix Mail Intelligence “Policy IP list” and “Newly Observed IP list” lists are helpful to prevent hailstorm spam, as in greylisting.
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