If you discover a security vulnerability, please do NOT open a public issue. Instead, please email the maintainers privately:

• Contact: amjha21122002@gmail.com
• Subject: [SECURITY] Email Checker Tool - Vulnerability Report

Please include:

• Description of the vulnerability
• Steps to reproduce
• Potential impact
• Suggested fix (if applicable)

We will acknowledge your report within 48 hours and provide an estimated timeline for a fix.

• This tool performs DNS queries without caching
• Each domain results in multiple DNS lookups
• Be mindful of DNS rate limiting

• Input CSV files are processed as-is without sanitization
• Ensure input files come from trusted sources
• No SQL injection risk (not database related)
• No code execution from CSV input

• Configurable workers prevent resource exhaustion on local system
• Rate limiting prevents overwhelming remote DNS servers
• Monitor memory usage with large domain lists

EOF