你好，张工

我iredmail从0.9.8升级到0.9.9后，每天postmaster帐户都收到邮件，提示cleanup_amavisd_db.py错误
具体错误提示如下：Traceback (most recent call last):
                         File "/opt/www/iredadmin/tools/cleanup_amavisd_db.py", line 54, in <module>
                         query_size_limit = settings.AMAVISD_CLEANUP_QUERY_SIZE_LIMIT
                         AttributeError: 'module' object has no attribute 'AMAVISD_CLEANUP_QUERY_SIZE_LIMIT'

  安装环境：ubuntu16.04
                mysql