Test Mail Server for Inbound TLS

Here’s how to test if a mail server supports TLS using a windows pc:

  1. nslookup
    > set q=mx
    > google.com
  2. The results:
    google.com   MX preference = 100, mail exchanger = google.com.s9a1.psmtp.com
    google.com   MX preference = 300, mail exchanger = google.com.s9b1.psmtp.com
    google.com   MX preference = 200, mail exchanger = google.com.s9a2.psmtp.com
    google.com   MX preference = 400, mail exchanger = google.com.s9b2.psmtp.com
  3. > exit
  4. telnet google.com.s9a1.psmtp.com 25
  5. After connected type:
    ehlo google.com
  6. If you see this in the output, the mail server supports inbound TLS communication:
    250-STARTTLS

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