If you need to test TLS connections you can use the OpenSSL s_client tool for this. SSL handshake has read 177 bytes and written 325 bytesĮxpansion: NONE # openssl s_client -connect :25 -starttls smtp # openssl s_client -connect :25 -starttls smtpĭidn't found starttls in server response, try anyway.ġ39702030079656:error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol:s23_clnt.c:774: Below you can see one example of a server that is not supporting TLS and another one that does.
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