});
                } catch (final Exception e) {
                    logger.warn("Failed to send a test mail.", e);
                } finally {
                    SMailCallbackContext.clearPreparedMessageHookOnThread();
                }
            }
            resultBuf.append("Status of ")
                    .append(ping.getClusterName())
                    .append(" is changed to ")

                    }
                    postcard.setJobname(systemProperties.getProperty("job.runtime.name", StringUtil.EMPTY));
                });
            } finally {
                SMailCallbackContext.clearPreparedMessageHookOnThread();
            }
        }
    }

    /**
     * Retrieves a value from a map with a default fallback.
     *
     * @param dataMap the map to retrieve the value from