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exchange relay smtp auth issue

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overdraft015

Programmer
Nov 25, 2007
123
GB
our head office have an exchange 2003 server which we can relay to from IIS smtp. we can relay for all users that are part of our domain without any authentication. if i try relay to an external user i get the following bounceback
:
You do not have permission to send to this recipient. For assistance, contact your system administrator.
<COMPUTERNAME #5.7.1 smtp;554 5.7.1 <EXTERNAL_EMAIL>: Relay access denied>

i am trying to setup IIS smtp to authenticate so we can send emails to external users via this method. we are using some php to email people from our webserver.

my problem is it never gets to the "smarthost" (the exchange server) if i enable authentication. i see the msg still in the queue folder and then eventually in the badmail folder.

is this possibly a restriction on the exchange server side? or have i missed something in IIS smtp?

Regards

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