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Spam Assassin

SpamAssassin is an open-source spam filter that uses rules and databases to identify and block unwanted email.

SpamAssassin, developed by the Apache Software Foundation, analyzes incoming emails against a set of rules and real-time blacklists to determine spam probability. It assigns a score to each message, and those exceeding a threshold are flagged or moved to a spam folder. This tool helps email servers reduce unwanted messages and protect users from phishing and malicious content.
Free Plan Available

You shouldn’t have to overpay for cold email tools. With Mystrika, you won’t.

It does cold email warmup, sequences, unified inbox, and AI writing - all in one place. Every other tool that does this charges somewhere between $100 and $500 a month. Mystrika has a free plan. 500 prospects. No expiry. No card.

The people who consistently book meetings from cold email aren’t smarter. They just stopped leaving money on the table.

See the Free Plan