Test Improvement - Email

[7h3Rabbit]

Suggested improvements:

• Improve MX validation
  • Validate if we can connect to all servers
• Validate STARTTLS support
• Validate Insecure connect support
• Validate TLS only support
• Validate Dane
• Validate Certificates (correct domain and chain)
• Validate DKIM?
• Validate e-mail enumeration possibility
• Validate send & receive? email
• Validate email headers (after receiving e-mail response)
• Test IPv4 and IPv6 on all found domains

[7h3Rabbit]

Extracted DMARC validation to #245

[cockroacher]

Additional suggestions (Found in TODO statements in code):

• Lets look for alternative email domain in DMARC records.
• Improve SPF Validation
  • Handle mx and +mx
  • Handle a and +a
  • Handle exists:
  • Handle redirect=
  • Handle exp=