各路英雄好汉,sendmail问题,紧急求援!!

kukul

我的sendmail测试时出现如下出错信息,那是什么缘故啊,请大家救救我.
May 18 01:28:14 www ipop3d[3760]: Auth user=joe host=good.kukul.net [192.168.1.2 53] nmsgs=0/0
May 18 01:28:14 www ipop3d[3760]: Logout user=joe host=good.kukul.net [192.168.1 .253] nmsgs=0 ndele=0
May 18 01:38:13 www ipop3d[3762]: pop3 service init from 192.168.1.253
May 18 01:38:13 www ipop3d[3762]: Auth user=joe host=good.kukul.net [192.168.1.2 53] nmsgs=0/0
May 18 01:38:13 www ipop3d[3762]: Logout user=joe host=good.kukul.net [192.168.1 .253] nmsgs=0 ndele=0
May 18 01:46:58 www ipop3d[3805]: pop3 service init from 192.168.1.253
May 18 01:47:01 www ipop3d[3805]: AUTHENTICATE LOGIN failure host=good.kukul.net  [192.168.1.253]
May 18 01:47:11 www last message repeated 2 times
May 18 01:48:13 www ipop3d[3806]: pop3 service init from 192.168.1.253
May 18 01:48:13 www ipop3d[3806]: Auth user=joe host=good.kukul.net [192.168.1.2 53] nmsgs=0/0
May 18 01:48:13 www ipop3d[3806]: Logout user=joe host=good.kukul.net [192.168.1 .253] nmsgs=0 ndele=0
May 18 01:50:11 www ipop3d[3805]: Autologout user=??? host=good.kukul.net [192.1 68.1.253]
May 18 01:51:30 www ipop3d[3822]: pop3 service init from 192.168.1.253
May 18 01:51:33 www ipop3d[3822]: AUTHENTICATE LOGIN failure host=good.kukul.net  [192.168.1.253]
May 18 01:52:03 www last message repeated 6 times
May 18 01:55:03 www ipop3d[3822]: Autologout user=??? host=good.kukul.net [192.1 68.1.253]
May 18 01:58:13 www ipop3d[3823]: pop3 service init from 192.168.1.253
May 18 01:58:13 www ipop3d[3824]: pop3 service init from 192.168.1.253
May 18 01:58:13 www ipop3d[3823]: Auth user=joe host=good.kukul.net [192.168.1.2 53] nmsgs=0/0
May 18 01:58:13 www ipop3d[3823]: Logout user=joe host=good.kukul.net [192.168.1 .253] nmsgs=0 ndele=0
May 18 01:58:16 www ipop3d[3824]: AUTHENTICATE LOGIN failure host=good.kukul.net  [192.168.1.253]
May 18 01:58:47 www last message repeated 10 times
May 18 01:59:50 www last message repeated 21 times
May 18 02:00:53 www last message repeated 21 times
May 18 02:01:15 www last message repeated 7 times
May 18 02:01:15 www ipop3d[3824]: Autologout host=good.kukul.net [192.168.1.253]
May 18 02:01:15 www ipop3d[3824]: Logout user=??? host=good.kukul.net [192.168.1