[exim] 500 error.. not sure why?

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Author: Xiaoyu Huang
Date:  
To: exim-users
Subject: [exim] 500 error.. not sure why?
Hello,

I write a php script to connect to exim smtp server and send mails. it does
work for exim 4.52. but after exim's upgraded to 4.53, a strange 500 error
happened.

Connecting to host address "----"...
Connected to SMTP server "----".
S 220-www.----.com ESMTP Exim 4.53 #0 Fri, 10 Feb 2006 06:22:50 +0000
S 220-We do not authorize the use of this system to transport unsolicited,
S 220 and/or bulk e-mail.
C EHLO ----.---
S 250-www.----.com Hello [U2FsdGVkX1+FCfshtmQPqq2mENv921a23S4Ud2D7KcA=] at
---- [----]
S 250-SIZE 52428800
S 250-PIPELINING
S 250-AUTH PLAIN LOGIN
S 250-STARTTLS
S 250 HELP
C AUTH PLAIN eW91cnBwdAB5b3VycHB0AGNmdDYmVUpN
S 235 Authentication succeeded
C MAIL FROM:<---@----.com>
C RCPT TO:<----@----.com>
C DATA
S 250 OK
S 250 Accepted
S 354 Enter message, ending with "." on a line by itself
C To: ---@----.com (ron snod)
Subject: sf
From: ---@----.com (Ron Snodgrasss)
X-Mailer: http://www.phpclasses.org/mimemessage $Revision: 1.58 $ (smtp
$Revision: 1.27 $)
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Date: Fri, 10 Feb 2006 00:22:46 CST
Message-ID: <20060210002246.3451.---@----.com>


C fasfdasfd
C
.
S 500 error
Disconnected.

at the end of the talk, a 500 error is raised. can you help me to find the
reason? thank you!

yours,
Xiaoyu