In this example, we will disable SSLv2 connection with the following command. We can enable or disable the usage of some of them. HTTPS or SSL/TLS have different subversions. $ openssl s_client -connect :25 -starttls smtp Connect HTTPS Site Disabling SSL2 We can use s_client to test SMTP protocol and port and then upgrade to TLS connection. $ openssl s_client -connect :443 -CAfile /etc/ssl/CA.crt Connect Smtp and Upgrade To TLS We will use -CAfile by providing the Certificate Authority File. If the web site certificates are created in house or the web browsers or Global Certificate Authorities do not sign the certificate of the remote site we can provide the signing certificate or Certificate authority. Check TLS/SSL Of Website Check TLS/SSL Of Website with Specifying Certificate Authority
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