cannot send or receive mail on new exchange server

just installed a new exchange 2010 SP2 into our new migrated domain (server 2003r2 to server 2008 r2).
right now, theres still our old 2003 exchange server online. i shutdowned it and tried to send/receive mails. i opened a testuser on the new exchange and sent out a mail.

the mails are stuck in the queue. however,with telnet it seems to work.

we have an ironmail smarthost where all the traffic gets routed through. the same error message shows up:

"12192011 15:40:42:Reply: '530 5.7.1 Client was not authenticated'

i have configured the smart host in out "outgoing" with its FQDN and IP address with no authentication,but the mails wont go through.

any suggestions?
quickslvrAsked:
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PaulD77Commented:
A few things to check...

First, in your organization config- Hub transport, check your accepted Domains Tab and if you're relaying through ironmail, make sure thats in there.

Click Send Connector Tab and make sure your SMTP is enabled and configured.

If all seems fine, run a mail flow trouble shooter from tool box and a remote connectivity analyzer.

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ded_chCommented:
That is a setting in the Send connector:

    Open Exchange Management Console
    Click on Hub Transport under Server Configuration
    Click on the corresponding hub in the top section
    Right-click on the  Receive Connector and select Properties
    On the Permission Groups Properties tab, select Anonymous users and press OK
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Windows Server 2008

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