我的mail 服务器很买，后来发现堆积了很多信，都不是我的域名下的，我怎么能防止一下这种情况呢？
我的是postfix 

59E287E44     5431 Fri Feb 17 22:46:38  tulspgysjklymp@ms48.hinet.net
                                         naijun03@yahoo.com.tw
                                         nerv13th@yahoo.com.tw
                                         mfrank@yahoo.com.tw
                                         myyourname@yahoo.com.tw
                                         onghr98@yahoo.com.tw
                                         npitt68@yahoo.com.tw
                                         richpost1@yahoo.com.tw
                                         p707748@yahoo.com.tw
                                         mst7630@yahoo.com.tw
                                         vwpi@yahoo.com.tw
                                         monica392@yahoo.com.tw
                                         mimicatty2000@yahoo.com.tw
                                         rex12013737@yahoo.com.tw
                                         nicholas7412@yahoo.com.tw
                                         michelle-19815@yahoo.com.tw
                                         pacs1979@yahoo.com.tw
                                         n048220149@yahoo.com.tw
                                         myemailcall@yahoo.com.tw
                                         rqnc@yahoo.com.tw
                                         xbox360ps3rev@yahoo.com.tw
                                         minimimitw@yahoo.com.tw
                                         p23770585@yahoo.com.tw
                                         mico122689@yahoo.com.tw
                                         s910169@yahoo.com.tw
                                         p55591@yahoo.com.tw
                                         oegl@yahoo.com.tw
                                         ppa12367@yahoo.com.tw
                                         mnmb@yahoo.com.tw
                                         rentongzhu@yahoo.com.tw
                                         qianfeiai@yahoo.com.tw
                                         rossibai23@yahoo.com.tw
                                         mimawassou@yahoo.com.tw
                                         wangwang3402@yahoo.com.tw
                                         miss_love_tp@yahoo.com.tw
                                         nons222@yahoo.com.tw
                                         nokei3330@yahoo.com.tw
                                         modernlife2004@yahoo.com.tw

这应该不是被黑了， 只不过你默认设置情况下，就把smtp端口公布出来，被垃圾邮件工具扫到了而已
你的postfix应该没有做验证机制吧？