- RFC-compliant email format checking
- Invalid character detection
- Domain format verification
- Optional invalid email saving
- MX Records: Verify mail server existence
- SPF Records: Check sender policy (optional)
- Caching: Store DNS results for performance
- Timeout Control: Configurable DNS query timeout
- Fetched from Quantium server
- 100+ email providers pre-configured
- Wildcard MX pattern matching
- Regular updates
- Free Providers: Gmail, Yahoo, Outlook, etc.
- Business Domains: Corporate and custom domains
- Regional Providers: Country-specific services
- Unknown Domains: Valid but unrecognized
- One file per detected provider
- Separate business email files
- Others with valid MX records
- Others without MX records
- Invalid addresses (optional)
- Process specific providers only
- Exclude certain providers
- Business/free separation
- MX record filtering
- Configurable thread count
- Parallel DNS lookups
- Concurrent file processing
- Memory-efficient streaming
- Result caching with TTL
- Batch DNS queries
- Connection pooling
- Retry on timeout
- Stream processing
- Live output flushing
- Progress tracking
- Memory optimization
- Auto-detect email column
- Configurable delimiters
- Header row handling
- Data preservation
- Maintain CSV structure
- Extract emails only
- Sort with metadata
- Custom column mapping