OSEC

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Subject: 500 Command unknown: '???'
From: Monty Poon (montyitronixtech.com)
Date: Thu Sep 28 2000 - 08:06:06 CDT

hi guys
please take a look

Unexpected response from dorsey.fcc.net[207.198.253.29].

Transcript of session follows.

 In: 220 dorsey.fcc.net ESMTP server (Post.Office v3.5.3 release 223 ID#
     0-57968U12500L1250S0V35) ready Thu, 28 Sep 2000 06:35:05 -0400
 Out: EHLO itxsv01.itronixtech.com
 In: 250-dorsey.fcc.net
 In: 250-HELP
 In: 250-EXPN
 In: 250-XREMOTEQUEUE
 In: 250-ETRN
 In: 250-PIPELINING
 In: 250 SIZE 10240000
 Out: MAIL FROM:<infosinowest.com.hk> SIZE=2099
 Out: RCPT TO:<freeintfcc.net>
 Out: DATA
 In: 500 Command unknown: '???'
 In: 500 Command unknown: '???????\NFOSINOWEST.COM.HK>'
 In: 503 Bad sequence of commands (specify MAIL first)
 Out: RSET
 Out: QUIT
 In: 503 No sender specified

we always get manys emails bounced with the above problem, is there any way
to solve it?
is it because of any firewall guard from my ISP?