tranphuchp1990/Fast-SMTP-scanner- — reverse-engineered prompt

Build me a fast SMTP security audit tool for servers I own or have permission to test. I want it to connect to a list of SMTP hosts and quickly show which ones are reachable, what banner they return, whether they support STARTTLS, which TLS versions and ciphers they allow, what certificate details they present, and which authentication methods they advertise. Make it multithreaded so it can scan a lot of servers quickly, and give me a simple interface that shows live progress, good results, failures, and clear error reasons.

I also want easy import of host lists, filtering and sorting of results, and export to CSV or JSON. If a server is configured with a test account I provide, let me optionally verify that it can send a harmless test email to my own mailbox so I can confirm the setup works. Please keep it defensive and safe, with rate limiting, timeouts, retries, and logs. Look up current SMTP and TLS docs online if you need to.