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Anyone know how open a SMTP conversation with a mail server (over the SSL port, and not 25/110) and view info for the SSL cert is it, using SMTP commands?

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  • Would be helpfull to know which platform you are using for the SMTP server?
    – JamesK
    Jul 1, 2010 at 14:34
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    Platform doesn't matter really in this case. He's asking how to connect remotely to a server and view info on its SSL certs.
    – EEAA
    Jul 1, 2010 at 14:37

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You're not going to be able to get any useful information only using SMTP commands. You'll need to use something that understands SSL, like OpenSSL's s_client. Something like this should work:

$ openssl s_client -starttls smtp -crlf -connect 1.1.1.1:25
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If it is an Exchange server, you can also try https://www.testexchangeconnectivity.com/

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