Helper/Transactional.php
public function getSmtpHost($storeId)
    {
        return $this->scopeConfig->getValue(
            self::XML_PATH_DDG_TRANSACTIONAL_HOST,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE,
            $storeId
        );
    }
public function getSmtpHost($storeId)
    {
        return $this->scopeConfig->getValue(
            self::XML_PATH_DDG_TRANSACTIONAL_HOST,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE,
            $storeId
        );
    }
public function getSmtpHost ( $ storeId ) { return $ this -> scopeConfig -> getValue ( self :: XML_PATH_DDG_TRANSACTIONAL_HOST , \ Magento \ Store \ Model \ ScopeInterface :: SCOPE_STORE , $ storeId ) ; }
Get transactional email host.

@param int $storeId

@return boolean|string
Get transactional email host .