touna.cn is an alias for mail.mxhichina.com.
mail.mxhichina.com is an alias for qiye.aliyun.com.
qiye.aliyun.com is an alias for alimail-access-agent-ay29.aliyun.com.
alimail-access-agent-ay29.aliyun.com is an alias for
alimail-access-agent-ay29.aliyun.com.gds.alibabadns.com.
alimail-access-agent-ay29.aliyun.com.gds.alibabadns.com has address 47.246.146.253