MailTemplateService.php

		$this->setCcAddresses($template->getCc());
		$this->setBccAddresses($template->getBcc());
		$this->setReplyToAddress($template->getReplyTo());
		$this->setFromName($fromName);
	}

	/**
	 * Sets the fromMail property of the mailTemplateService.
	 * Checks validity and uses all available fallbacks
	 *
	 * @param string $fromMail
	 * @return string
	 */
	private function getValidFromMail($fromMail): string {
		$fromMail = \trim($fromMail);
		if (!\filter_var($fromMail, FILTER_VALIDATE_EMAIL)) {
			$fromMail = $this->fromAddress;
		}
		if (!\filter_var($fromMail, FILTER_VALIDATE_EMAIL)) {
			$fromMail = $GLOBALS['TYPO3_CONF_VARS']['MAIL']['defaultMailFromAddress'];
			if (!\filter_var($GLOBALS['TYPO3_CONF_VARS']['MAIL']['defaultMailFromAddress'], FILTER_VALIDATE_EMAIL)) {
				$fromMail = 'noreply@example.com';
			}
		}

		return $fromMail;
	}

	/**
	 * Get a single variable containing a list of all markers
	 *
	 * @param array $markers
	 * @return string
	 */
	private function getAllMarker(array $markers): string {
		$allMarker = '';

		foreach ($markers as $key => $value) {
			if (\array_key_exists($key, $this->markerLabels) && $this->markerLabels[$key] !== NULL) {
				$key = $this->markerLabels[$key];
			}

			if (\is_string($value)) {
				$allMarker .= $key . ': ' . $value . PHP_EOL;
			} elseif (\is_array($value)) {
				foreach ($value as $innerKey => $innerValue) {
					$allMarker .= $key . '.' . $innerKey . ': ' . $innerValue . PHP_EOL;
				}
			} elseif (\is_bool($value)) {
				$valueAsString = $value ? 'true' : 'false';
				$allMarker .= $key . ': ' . $valueAsString . PHP_EOL;
			} elseif (\is_object($value)) {
				if (\method_exists($value, '__toString')) {
					$allMarker .= $key . ': ' . $value->__toString() . PHP_EOL;
				}
			}
		}

		return $allMarker;
	}
}