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The NDR has the wrong email address

When sending an email using Outlook via an Exchange server to an external address an NDR is received, which contains a different email address to the one originally sent to.
The address was entered manually.

The sent items & the exchange message tracking show the correct address.
The internal exchange server passes the message to a frontend server & onto mailcontrol.
The logs in mailcontrol show the incorrect address.

eg. the email was sent to a.name@dom.co.uk
Mailcontrol & the NDR show the address ka.name@dom.co.uk

The address appears to be changed somewhere between the internal exchange server receiving it & mailcontrol logging its reception.
The following recipient(s) could not be reached:
Ann Name on 05/02/2009 15:37
You do not have permission to send to this recipient. For assistance, contact your system administrator.
<rly50j.srv.mailcontrol.com #5.7.1 SMTP; 550 5.7.1 < ka.name@dom.co.uk>... Unrouteable address>

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1 Solution
This can happen if the responsible mailserver for @dom.co.uk is configured to forward a.name to ka.name - and ka.name does not exist.
specialistservicesAuthor Commented:
The email address has changed before it gets to the mailserver for @dom.co.uk.

When it passes through Mailcontrol (spam filtering) on the way out from the exchange servers it already has the wrong address.
specialistservicesAuthor Commented:
Found a contact in Exchange, this is why the NDR came back with a name even though the user only entered an email address. Email address was entered correctly in Outlook, exchange found the contact and tried to send to the incorrect address entered in the Active Directory Contact.

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