property AsyncStartTLS: boolean; default False;
Determines whether the server will wait till the TLS/SSL handshake for a new session is complete, or whether the control should be returned to the user immediately after creating a socket connection.
Set AsyncStartTLS to True to return control to the server immediately after creating a socket connection, without waiting to a TSL connection. A TLS connection will be established asynchronously in a separate thread.
Set AsyncStartTLS to False to to return control to the server only after the TLS/SSL handshake is complete.
The default value is False.