code: public static void setPersonEmail(final String email) {
  		dispatchConversationTask(new ConversationDispatchTask() {
  			@Override
  			protected boolean execute(Conversation conversation) {
  				ApptentiveInternal.getInstance().getConversationProxy().setPersonEmail(email);
  				return true;
  			}
  		}, "set person email");
  	}
docs: Sets the user's email address. This email address will be sent to the Apptentive server to allow out of app
  communication, and to help provide more context about this user. This email will be the definitive email address
  for this user, unless one is provided directly by the user through an Apptentive UI. Calls to this method are
  idempotent. Calls to this method will overwrite any previously entered email, so if you don't want to overwrite
  the email provided by the user, make sure to check the value with {@link #getPersonEmail()} before you call this method.
  
  @param email The user's email address.