Old Exchange server showing in message headers

I have a customer that is currently in a coexistence mode with 2003 and 2010. All mailboxes are now moved and we want to route all mail to exchange 2010. We created a secondary IP to send to on there SH (MessageLabs) which should NAT to the Exchange 2010 servers. When we send a text message to this from ML and review the headers we see the following in the headers

Received: from Exchange 2010 svr1 (10.1.2.2) by Exchange 2010 svr2 (10.1.2.3) with Microsoft SMTP Server (TLS) Id xxx date xx time xx
Received: from Exchange 2003 svr1 (10.1.3.2) by mail.domain.com (10.1.2.2)  with Microsoft SMTP Server Id xxx date xx time xx
Received from mail.x.messagelabs.com (195.x) by Exchange 2003 svr1 with Microsoft SMTPSVC date xx time xx

I'm not sure why the Exchange 2003 server is mentioned in the headers

Any ideas
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StuartTechnical Architect - CloudAsked:
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Amit KumarCommented:
It seems your external e-mail still going through Exchange 2003, please create send connector on Exchange 2010 and disable RGC on Exchange 2003 or shutdown if everything is migrated on Exchange 2010.
StuartTechnical Architect - CloudAuthor Commented:
They currently have two send connectors, one on each platform. I can delete the 2003 one now but how would that affect inbound mail?
Amit KumarCommented:
oh I think I misunderstood here, you are getting Exchange 2003 servers when mail is being received from Message labs.

did you check if you have given next hop (Public IPs) in message labs those are pointing to Exchange 2003. Message labs would have next hop (public IPs) pointing to Exchange 2010 only.
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StuartTechnical Architect - CloudAuthor Commented:
So mx points to message labs, then message labs is configured to send to 2003 as primary then 2010 as secondary. Before removing 2003 and setting 2010 to primary I wanted to test mail flow.

Message labs lets you test mail flow to a server so that's what I did, but when sending a test to 2010 I didn't expect to see mentions of 2003 on the headers
Amit KumarCommented:
better you log a case in Message Labs and let them check may be it is taking time to replicate at their side.

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StuartTechnical Architect - CloudAuthor Commented:
Message labs 'test' function still routed through the default route
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