Server rejects outgoing mail from PC's but will send mail from Macs

I am having a strange problem with outgoing mail all my mail clients are pointed to the server as smtp server. All mail from Macs are delivered without any problems but mail from PC's are universally rejected and I can't understand why. I did not have this problem with 10.4.11 and we do not authenticate. Here is the reject message:-
+Your message did not reach some or all of the intended recipients.+
+Subject: hello 16:34+
+Sent: 26/08/2010 16:34+
+The following recipient(s) cannot be reached:+
+'user@cp-lighting..*' on 26/08/2010 16:34+
+504 5.5.2 <PHILSPC>: Helo command rejected: need fully-qualified hostname+

This should help:
http://osx.topicdesk.com/content/view/145/84/
Will work without authentication as long as your network range has been entered into the postfix settings.
That said, you should require all your clients to authenticate to send through your server.
HTH,
Alex

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