Audit SSL certificates, HTTP headers, and email security.
Check if IP/domain is blacklisted on 40+ spam lists
Check SPF, DKIM, DMARC records
Inspect response headers and server info
Scan common ports (21, 22, 80, 443, etc.)
Scan for CSP, HSTS, X-Frame-Options
Verify SSL certificate details and validity
Track 301/302 redirect chains