relay to c18-ss-1-lb-cnet.com

我有部 centos, default setup, 我 check 到佢會定時 send 返 d log 去 root account, 但係
唔知點解 sendmail 會 connect 去 c18-ss-1-lb-cnet.com port 25 做 relay

我 check 過 /etc/mail/ 唔見有 setting 關於 c18-ss-1-lb-cnet.com, 仲可以 check 邊度呢?