[courier-users] 456 plus 502 errors

I need help with this one, if I try to send an email to anyone at
@bigpond.net.au I get these 2 errors below but if I telnet to their
MX hosts port 25 directly then a test message will go through okay
so it seems to only be a problem when I send via my local courier-mta.

Apr 30 16:09:27 mail courieresmtpd: error,relay=::ffff:xx.240.81.28,
from=<markc@renta.net>,to=<xyz@bigpond.net.au>:
456 Address temporarily unavailable.

Apr 30 16:09:27 mail courieresmtpd: error,
relay=::ffff:xx.240.81.28,msg="502 ESMTP command error",cmd: DATA

I've tried disabling any security connections...

#cat /etc/courier/esmtproutes
extmail.bpbb.bigpond.com: /SECURITY=NONE
bigpond.net.au: /SECURITY=NONE

but there is no improvement. My mail servers IP is not on any RBL
list according to "rblcheck". I was hoping to get a clue from the
below direct smtp injection.

Any suggestions what the problem may be or how to debug this any
further ?

--markc


# dig +short mx bigpond.net.au.
0 extmail.bpbb.bigpond.com.

# telnet extmail.bpbb.bigpond.com 25
Trying 61.9.168.122...
Connected to extmail.bpbb.bigpond.com.
Escape character is '^]'.
220 nskntingx02p.mx.bigpond.com ESMTP server ready Wed, 30 Apr 2008 06:10:16 +0000
EHLO mail.renta.net
250-nskntingx02p.mx.bigpond.com
250-ETRN
250-AUTH=LOGIN PLAIN
250-AUTH LOGIN PLAIN
250-PIPELINING
250-DSN
250-8BITMIME
250 SIZE 15728640
MAIL FROM: markc@renta.net
250 Sender <markc@renta.net> Ok
RCPT TO: xyz@bigpond.net.au
250 Recipient <xyz@bigpond.net.au> Ok
DATA
354 Ok Send data ending with <CRLF>.<CRLF>
Testing email, please ignore.

--markc
..
250 Message received: 20080430061141.VMOA19654.nskntingx02...mail.renta.net
QUIT
221 nskntingx02p.mx.bigpond.com ESMTP server closing connection
Connection closed by foreign host.

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