Problems with Send on Behalf of permissions

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    Hello all,

    I have an Exchange 2003 server setup and serving mail to 10 accounts that are not part of my Windows 2003 domain.

    These users connected via IMAP SSL to download their email. One of the users has requested to be able to send on behalf of. So I did the following but it fails:

    Granted the user full access the the other users mailbox
    Granted Send As access in the security tab of the other user

    I see this error in my event log on the Exchange server:

    Event ID: 7004

    This is an SMTP protocol error log for virtual server ID 1, connection #5671. The remote host “212.x.x.x”, responded to the SMTP command “xexch50” with “504 Need to authenticate first “. The full command sent was “XEXCH50 1020 2 “. This will probably cause the connection to fail.

    Any ideas why its failing? I don’t see anything in my SMTP logs. MY firewall is passing the traffic untouched to the exchange server.

    Thanks in advance,

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