How to setup a self signed OpenSSL PKI
Retrieve the certificate from a server
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openssl s_client -connect "SERVER:PORT" < /dev/null 2>/dev/null | openssl x509 -outform pem 2>/dev/null openssl s_client -connect "SERVER:PORT" -starttls smtp < /dev/null 2>/dev/null | openssl x509 -outform pem 2>/dev/null