def enable_ssl(verify_or_params = {}, certs = nil, port = nil)
      begin
        @ssl_params = verify_or_params.to_hash.dup
        @port = @ssl_params.delete(:port) || @port
      rescue NoMethodError
        @ssl_params = POP3.create_ssl_params(verify_or_params, certs)
        @port = port || @port
      end
    end
:call-seq:
Net::POP#enable_ssl(params = {})

Enables SSL for this instance.  Must be called before the connection is
established to have any effect.
+params[:port]+ is port to establish the SSL connection on; Defaults to 995.
+params+ (except :port) is passed to OpenSSL::SSLContext#set_params.