This is the Postfix program at host mxout-07.mxes.net.

I'm sorry to have to inform you that your message could not be
delivered to one or more recipients.  Here is the reason why the
message could not be delivered.

<bbc_iplayer_website@bbc.co.uk>: host
    cluster1.eu.messagelabs.com[195.245.231.99] said: 550-Invalid recipient
    <bbc_iplayer_website@bbc.co.uk> 550 (#5.1.1) (in reply to RCPT TO command)



Reporting-MTA: dns; mxout-07.mxes.net
X-Postfix-Queue-ID: 46B5F22E258
X-Postfix-Sender: rfc822; tim@timwise.co.uk
Arrival-Date: Sat, 21 Jan 2012 07:42:03 -0500 (EST)

Final-Recipient: rfc822; bbc_iplayer_website@bbc.co.uk
Original-Recipient: rfc822;bbc_iplayer_website@bbc.co.uk
Action: failed
Status: 5.0.0
Remote-MTA: dns; cluster1.eu.messagelabs.com
Diagnostic-Code: smtp; 550-Invalid recipient <bbc_iplayer_website@bbc.co.uk>
    550 (#5.1.1)