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Scanning IP addresses that you do not own can be flagged as malicious activity by ISPs and may lead to legal consequences or service termination. Better Alternatives

Checking if the server properly enforces encryption (STARTTLS) and secure login credentials. The Technical Risks of Third-Party Utility Downloads Speed Smtp Scanner V2.5 Free Download

Platforms like MXToolbox provide free, web-based diagnostic utilities to check your server's relay status, MX records, and blacklist reputation without installing any local software. Conclusion Scanning IP addresses that you do not own

Running unauthorized high-speed scans against external networks can cause your public IP address to be flagged for abusive behavior. Internet Service Providers (ISPs) and security threat intelligence feeds quickly blacklist IPs conducting aggressive scanning, which can disrupt your legitimate internet connectivity and trigger legal compliance inquiries. Secure and Legitimate Alternatives for SMTP Testing Speed Smtp Scanner V2.5 Free Download