+ /**
+ * {@inheritDoc}
+ */
+ public function getAdditionalMailHeaderString()
+ {
+ $headerString = '';
+
+ foreach ($this->additionalMailHeader as $name => $values) {
+ if (is_array($values)) {
+ foreach ($values as $value) {
+ $headerString .= "$name: $value\n";
+ }
+ } else {
+ $headerString .= "$name: $values\n";
+ }
+ }
+ return $headerString;
+ }
+