求教邮件发送失败的错误

jia

Mon 2004-09-27 15:17:18: [-1:5] > Parsing Message <C:\MDAEMON\Remoteq\Retry\pd90000000095.msg><br>
Mon 2004-09-27 15:17:18: [-1:5] > From: flora.li@beijing.idp.edu.au<br>
Mon 2004-09-27 15:17:18: [-1:5] > To: h.lo@unsw.edu.au<br>
Mon 2004-09-27 15:17:18: [-1:5] > Subject: Re: China Education Expo. 2004<br>
Mon 2004-09-27 15:17:18: [-1:5] > Message-ID: <005901c4a43b$432ee8f0$b701a8c0@flora><br>
Mon 2004-09-27 15:17:18: [-1:5] MX-record resolution of [unsw.edu.au] in progress (DNS Server: 202.106.0.20)...<br>
Mon 2004-09-27 15:17:18: [-1:5] P=020 D=unsw.edu.au TTL=(5) MX=[smtp20.unsw.edu.au] {149.171.96.26}<br>
Mon 2004-09-27 15:17:18: [-1:5] P=010 D=unsw.edu.au TTL=(5) MX=[smtp.unsw.edu.au] {149.171.193.32}<br>
Mon 2004-09-27 15:17:18: [-1:5] Attempting MX: P=010 D=unsw.edu.au TTL=(5) MX=[smtp.unsw.edu.au] {149.171.193.32}<br>
Mon 2004-09-27 15:17:18: [-1:5] Attempting SMTP connection to [149.171.193.32 : 25]<br>
Mon 2004-09-27 15:17:18: [516:5] Waiting for socket connection...<br>
Mon 2004-09-27 15:17:18: [516:5] Socket connection established<br>
Mon 2004-09-27 15:17:18: [516:5] Waiting for protocol initiation...<br>
Mon 2004-09-27 15:17:26: [516:5] 220 ok RsProxyServer Ready<br>
Mon 2004-09-27 15:17:26: [516:5] EHLO beijing.idp.edu.au<br>
Mon 2004-09-27 15:17:26: [516:5] 250-RsProxyServer says hello<br>
Mon 2004-09-27 15:17:26: [516:5] 250-SIZE 0<br>
Mon 2004-09-27 15:17:26: [516:5] 250-8BITMIME<br>
Mon 2004-09-27 15:17:26: [516:5] 250-DSN<br>
Mon 2004-09-27 15:17:26: [516:5] 250-ETRN<br>
Mon 2004-09-27 15:17:26: [516:5] 250-AUTH=LOGIN<br>
Mon 2004-09-27 15:17:26: [516:5] 250 EXPN<br>
Mon 2004-09-27 15:17:26: [516:5] MAIL From:<flora.li@beijing.idp.edu.au> SIZE=27867<br>
Mon 2004-09-27 15:17:26: [516:5] 505 Error: Client was not authenticated<br>
Mon 2004-09-27 15:17:26: [516:5] QUIT<br>
Mon 2004-09-27 15:17:26: [-1:5] Attempting MX: P=020 D=unsw.edu.au TTL=(5) MX=[smtp20.unsw.edu.au] {149.171.96.26}<br>
Mon 2004-09-27 15:17:26: [-1:5] Attempting SMTP connection to [149.171.96.26 : 25]<br>
Mon 2004-09-27 15:17:26: [468:5] Waiting for socket connection...<br>
Mon 2004-09-27 15:17:26: [468:5] Socket connection established<br>
Mon 2004-09-27 15:17:26: [468:5] Waiting for protocol initiation...<br>
Mon 2004-09-27 15:17:29: [468:5] This message is 0 days old; it has 5 days left to get delivered<br>
Mon 2004-09-27 15:17:29: [468:5] SMTP session abnormally terminated, 170 bytes transferred.<br>
Mon 2004-09-27 15:17:29: ----------<br>
<br>
其中505错误是什么意思？<br>
505 Error: Client was not authenticated<br>
<br>
谢谢各位。<br>
<br>