Bitrix24Email::addSignature

static function addSignature(&$message, $contentType = 0)
{
	if(!Bitrix24Manager::isEnabled())
	{
		return false;
	}

	self::includeLangFile();

	$text = '';
	if(!Bitrix24Manager::isPaidAccount())
	{
		$text = GetMessage('CRM_B24_EMAIL_FREE_LICENSE_SIGNATURE');
	}
	elseif(self::isSignatureEnabled())
	{
		$text = GetMessage('CRM_B24_EMAIL_PAID_LICENSE_SIGNATURE');
	}

	if($text === '')
	{
		return false;
	}

	if(!\CCrmContentType::IsDefined($contentType))
	{
		$contentType = \CCrmContentType::PlainText;
	}

	if($contentType === \CCrmContentType::BBCode)
	{
		$message .= "\n\n".$text;
	}
	elseif($contentType === \CCrmContentType::Html)
	{
		//Convert BBCODE to HTML
		$parser = new \CTextParser();
		$message .= "

".$parser->convertText($text);
	}
	elseif($contentType === \CCrmContentType::PlainText)
	{
		$message .= "\n\n".preg_replace('/\[[^\]]+\]/', '', $text);
	}

	return true;
}