[B<-no_tls1>]
[B<-bugs>]
[B<-cipher cipherlist>]
+[B<-starttls protocol>]
[B<-engine id>]
[B<-rand file(s)>]
supported cipher in the list sent by the client. See the B<ciphers>
command for more information.
+=item B<-starttls protocol>
+
+send the protocol-specific message(s) to switch to TLS for communication.
+B<protocol> is a keyword for the intended protocol. Currently, the only
+supported keyword is "smtp".
+
=item B<-engine id>
specifying an engine (by it's unique B<id> string) will cause B<s_client>