The blacklist check is a tool that assesses a mail server's IP address by cross-referencing it with more than 100 DNS-based email blacklists, often referred to as Realtime blacklists, DNSBLs, or RBLs. When a mail server's IP address is blacklisted, there is a risk that some of the emails sent from that server may not reach their intended recipients.
These email blacklists serve as a widely used method for minimizing the impact of spam emails.
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