Improved TLS handling on SMTP connections:

• Fixed the Use TLS connection field so it is now honored; port 465 (implicit TLS) now connects correctly
• Inferred TLS mode from the port: 465 uses implicit TLS, and 587/2525 enforce STARTTLS when Use TLS is enabled, preventing downgrade attacks from the previous opportunistic STARTTLS behavior

Updated spectral version

Various modernizations and documentation updates