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I make and spammer blocker script, using a list and custom hosts i know directly into /etc/hosts, tested in rpi 4 buster 10, let me know if works in other platforms, i hope you find this useful, thanks
reddit.com/r/raspberry_pi | 2021-01-13
Basic stop-spammers repo stats
12 days ago
dzup/stop-spammers is an open source project licensed under GNU General Public License v3.0 only which is an OSI approved license.