# File lib/protocols/smtpclient.rb, line 188
188:                 def invoke_starttls
189:                         if @args[:starttls]
190:                                 # It would be more sociable to first ask if @server_caps contains
191:                                 # the string "STARTTLS" before we invoke it, but hey, life's too short.
192:                                 send_data "STARTTLS\r\n"
193:                                 @responder = :receive_starttls_response
194:                         else
195:                                 invoke_auth
196:                         end
197:                 end