Exch 2003 #5.5.0 smtp;553 + unable to verify address

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Hi, I've got a problem sending mails to domains hosted by some ISP's. The
mail cannot be delivered and the error message is something like this
(SMARTHOST is our ISP smtp relay , RECIPIENT is recipient (doh), DOMAIN is
recipients domain and LOCALDOMAIN is the Exchangeservers local domain):

**** snip ****

This is the Postfix program at host SMARTHOST.

I'm sorry to have to inform you that your message could not be be delivered
to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can delete your own
text from the attached returned message.

The Postfix program

<RECIPIENT@DOMAIN>: host mailgw1.tiscali.dk[212.54.64.159] said: 553
<SENDER@LOCALDOMAIN> unable to verify address (in reply to MAIL FROM
command)

**** snip ****

The DNS is correctly configured, also there is a reverse lookup zone for the
domain. This problem only occurs while sending from the Exchange 2003 server,
sending from Exchange 2000 is no problem, and various Linux based MTA's has
no problems.

any suggestions?
.



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