#5.1.1 SMTP; 550 Address unknown> #SMTP#

Hi,

I am in the middle onf an Exchange 2003 to 2007 upgrade and have moved the Services like SMTP, OWA etc to the new server.

I have moved a couple of mailboxes accross and now when emails are sent to those email addresses with mailboxes on the new server the sender gets a undeliverable messsage:

#5.1.1 SMTP; 550 Address unknown> #SMTP#

Those users on the old server can received mail?

Please can you help.

Thanks

Jules
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juleswaleAsked:
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James HIT DirectorCommented:
Can you try to have the user send without using the cached email address?
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juleswaleAuthor Commented:
The Users can send out but not receive mail.
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Sunil ChauhanLead AdministratorCommented:
hey have to placed a receive connector in 2k7 and a send connector in 2k3?
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juleswaleAuthor Commented:
Sorry,

I have just been told that all users cannot received Mail, and yes there is a routing connector between the two.
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Sunil ChauhanLead AdministratorCommented:
can you double check if there is a receive connector on hub server
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RadweldCommented:
When you say there is a routing group connector, is this a two way connector? When I perform transitions from 2003 to 2007 or 2010 I always delete the automatically generated routing group connector and create my own,

 
New-RoutingGroupConnector -Name "Interop RGC" -SourceTransportServers "Hub2010.contoso.com" -TargetTransportServers "Bridgehead2003.contoso.com" -Cost 100 -Bidirectional $true

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Taken from

http://technet.microsoft.com/en-us/library/aa998574.aspx

Alternative you need to review the message tracking logs to see what's happening, Exchange 2003 sends and email to Exchange 2007 via the routing group connector just like if you send or receive mail externally, Failed mail can be diagnosed in the same way.
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RadweldCommented:
To send mail between Exchange 2003 and 2007 you do not need a send connector or a receive connector, all communications occur via the Routing Group Connector.
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