--sslproto <name>
              (Keyword:  sslproto)  Forces  an SSL protocol. Possible values are âssl2â, âssl3â, âssl23â, and âtls1â. Try
              this if the default handshake does not work for your server. To defeat automatic TLSv1 negotiation when the
              server  advertises  STARTTLS  or  STLS,  use  ââ  or  âssl23â.  The default is to try appropriate protocols
              depending on context.