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SpamAssassin - Use this program to "Unspam" your mailbox(es).
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
MailScanner - MailScanner is a open source email security system design for Linux-based email gateways.
Hiya - Know who's calling or texting and block spammers on Android
Rspamd - Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules...
Credo360 - Figure out who to trust by looking at a social credit score