Message filtering is the automated screening of incoming or outgoing texts to distinguish suspicious messages from ordinary traffic. A messaging service or device may assess signals such as message content, sender reputation, links, or patterns associated with spam and scams, then block, quarantine, or flag a message. The specific checks vary by system.
In cyber security, filtering can reduce exposure to phishing, fraud, and malicious links before a person acts on them. Attackers may try to evade filters by changing wording, using new accounts, or moving conversations to another channel, so filtering is a defensive layer rather than a guarantee. It works best alongside clear warnings, user judgment, and other protections.