The blacklist check is a crucial tool used to evaluate the reputation of a mail server's IP address. It operates by comparing the server's IP against a comprehensive database of over 100 DNS-based email blacklists, commonly known as Realtime Blacklists (RBLs), DNS Blacklists (DNSBLs), or simply blacklists. These blacklists are curated databases that track and list IP addresses associated with spamming or other malicious activities. When a mail server's IP address appears on one or more blacklists, it indicates a potential risk for email deliverability issues. Emails originating from blacklisted servers may be flagged as spam or rejected outright by recipient servers, leading to significant communication disruptions.
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