MDaemon的日志...谁帮解读一下什么意思

过街小强

Failed address: simonli@hayco.com.hk

--- Session Transcript ---
Tue 2011-08-16 17:27:44: Parsing message <xxxxxxxxxxxxxxxxxxxxxxxx\pd35000017787.msg>
Tue 2011-08-16 17:27:44: *  From: yo.zhou@polecoz.com
Tue 2011-08-16 17:27:44: *  To: simonli@hayco.com.hk
Tue 2011-08-16 17:27:44: *  Subject: =?gb2312?B?tPC4tDogsqnBprjfVFQgUENCQSAxMC9BdWcvMTHAtMHPsrvBvFNDQVI=?=
Tue 2011-08-16 17:27:44: *  Size (bytes): 219810
Tue 2011-08-16 17:27:44: *  Message-ID: <EF5E079784884D90BC24A8F7FA8E0EBA@NIKI>
Tue 2011-08-16 17:27:44: Attempting SMTP connection to [hayco.com.hk]
Tue 2011-08-16 17:27:44: Resolving MX records for [hayco.com.hk] (DNS Server: 192.168.1.1)...
Tue 2011-08-16 17:27:44: *  P=010 S=002 D=hayco.com.hk TTL=(10) MX=[mail01.hayco.com.hk] {152.101.43.99}
Tue 2011-08-16 17:27:44: *  P=020 S=000 D=hayco.com.hk TTL=(10) MX=[mail02.hayco.com.hk] {58.177.86.156}
Tue 2011-08-16 17:27:44: *  P=100 S=001 D=hayco.com.hk TTL=(10) MX=[relay.email.hk.net]
Tue 2011-08-16 17:27:44: Attempting SMTP connection to [152.101.43.99:25]
Tue 2011-08-16 17:27:44: Waiting for socket connection...
Tue 2011-08-16 17:27:45: *  Connection established (192.168.1.2:1258 -> 152.101.43.99:25)
Tue 2011-08-16 17:27:45: Waiting for protocol to start...
Tue 2011-08-16 17:27:45: <-- 220 ASAV1.haycohk.com.hk ESMTP
Tue 2011-08-16 17:27:45: --> EHLO intra.polecoz
Tue 2011-08-16 17:27:45: <-- 250-ASAV1.haycohk.com.hk
Tue 2011-08-16 17:27:45: <-- 250-PIPELINING
Tue 2011-08-16 17:27:45: <-- 250-SIZE 50240000
Tue 2011-08-16 17:27:45: <-- 250-ETRN
Tue 2011-08-16 17:27:45: <-- 250 8BITMIME
Tue 2011-08-16 17:27:45: --> MAIL From:<yo.zhou@polecoz.com> SIZE=219810
Tue 2011-08-16 17:27:45: <-- 250 Ok
Tue 2011-08-16 17:27:45: --> RCPT To:<simonli@hayco.com.hk>
Tue 2011-08-16 17:27:45: <-- 250 Ok
Tue 2011-08-16 17:27:45: --> DATA
Tue 2011-08-16 17:27:47: <-- 354 End data with <CR><LF>.<CR><LF>
Tue 2011-08-16 17:27:47: Sending <xxxxxxxxxxxxxxxxxxxxxxxx\pd35000017787.msg> to [152.101.43.99]
Tue 2011-08-16 17:28:46: *  Winsock Error 10054 Connection was reset by the other side!
Tue 2011-08-16 17:28:46: Error writing to socket
Tue 2011-08-16 17:28:46: Socket connection closed by the other side (how rude!)
Tue 2011-08-16 17:28:46: *  Winsock Error 10053 Connection abort.
Tue 2011-08-16 17:28:46: Connection closed
Tue 2011-08-16 17:28:46: Attempting SMTP connection to [58.177.86.156:25]
Tue 2011-08-16 17:28:46: Waiting for socket connection...
Tue 2011-08-16 17:28:46: Attempting SMTP connection to [relay.email.hk.net:25]
Tue 2011-08-16 17:28:46: Resolving A record for [relay.email.hk.net] (DNS Server: 192.168.1.1)...
Tue 2011-08-16 17:28:46: *  Connection established (192.168.1.2:1303 -> 58.177.86.156:25)
Tue 2011-08-16 17:28:46: Waiting for protocol to start...
Tue 2011-08-16 17:28:46: *  D=relay.email.hk.net TTL=(10) A=[202.76.4.36]
Tue 2011-08-16 17:28:46: Attempting SMTP connection to [202.76.4.36:25]
Tue 2011-08-16 17:28:46: Waiting for socket connection...
Tue 2011-08-16 17:28:49: *  Connection established (192.168.1.2:1304 -> 202.76.4.36:25)
Tue 2011-08-16 17:28:49: Waiting for protocol to start...
Tue 2011-08-16 17:28:49: Transfer Complete
Tue 2011-08-16 17:28:49: <-- 220 relay2.hk.net ESMTP
Tue 2011-08-16 17:28:49: --> EHLO intra.polecoz
Tue 2011-08-16 17:28:50: <-- 502 5.5.2 Error: command not recognized
Tue 2011-08-16 17:28:50: --> HELO intra.polecoz
Tue 2011-08-16 17:28:50: <-- 502 5.5.2 Error: command not recognized
Tue 2011-08-16 17:28:50: --> QUIT
--- End Transcript ---

intra.polecoz是内网邮箱... 看不太明白 502 5.5.2 Error:command not recognized
一般是什么情况才会这样?