gtk_widget_set_sensitive (self->entry_outgoingserver, !username_known);
gtk_widget_set_sensitive (self->entry_outgoing_username, !username_known);
gtk_widget_set_sensitive (self->entry_incoming_port, !username_known);
gtk_widget_set_sensitive (self->entry_outgoingserver, !username_known);
gtk_widget_set_sensitive (self->entry_outgoing_username, !username_known);
gtk_widget_set_sensitive (self->entry_incoming_port, !username_known);