Hmmmm.. it looks like you are not sending a HELO...
mx01:~/$ telnet gw1.sesahs.nsw.gov.au smtp
Trying 203.10.48.11...
Connected to gw1.sesahs.nsw.gov.au.
Escape character is '^]'.
220 gw1 SMTPXD version 57 ready at Fri, 27 Apr 2001 15:13:01 EST
mail from:<[EMAIL PROTECTED]>
503 please introduce yourself, first
As opposed to,
mx01:~/$ telnet gw1.sesahs.nsw.gov.au smtp
Trying 203.10.48.11...
Connected to gw1.sesahs.nsw.gov.au.
Escape character is '^]'.
220 gw1 SMTPXD version 57 ready at Fri, 27 Apr 2001 15:14:03 EST
HELO
250 gw1 Hello mx01.flux.net.au, pleased to meet you
MAIL FROM:<[EMAIL PROTECTED]>
250 <[EMAIL PROTECTED]>... Sender ok
Is it being sent by your own mail server or by MPX?
| ... while talking to gw1.sesahs.nsw.gov.au.:
| >>> MAIL From:<[EMAIL PROTECTED]>
| <<< 503 please introduce yourself, first
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