Exchange 2010 - wildcard / catchall inbound addresses

I'm just getting started with Exchange 2010.  I've used Exchange 2003 for a while now, but I'm by no means an expert.

We have on subdomain that will require wildcard addressing.  There are the standard users:
bob@subdomain.us.org
mary@subdomain.us.org
joe@subdomain.us.org
and those should work as normal.

However, if a message comes in for anthing else @subdomain.us.org it should go to bob@subdomain.us.org.  I know this can create a huge possibility for spam, but it's a business necessity and will only be for this one subdomain and it's internal only.

I know this was possilbe in EX2003 with some sort of catchall script, but I never implemented that.  I'm assuming with the EX07/EX10 differences, that there's another way.

Any insight is appreciated.
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Berkson WeinTech FreelancerAsked:
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AkhaterCommented:
here is how to do it http://technet.microsoft.com/en-us/library/bb691132%28EXCHG.80%29.aspx

it is for 2007 but the same applies for 2010, however I have to strongly advise you against catchall mailboxes it is just calling for spam
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Berkson WeinTech FreelancerAuthor Commented:
Thanks Akhater.  I wasn't sure if that article also applied to 2010.  Spam won't be a problem, as the subdomain won't be externally accessible and there's an antispam server (not exchange) installed at this client.
Related: the article says that recipient filtering needs to be turned off.  Can this be done by domain or does it have to be for all domains on the server?
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AkhaterCommented:
you won't need to do anything with recipient filtering since you don't have Exchange Edge installed
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Tier1NetCommented:
Along these same lines, we have an older domain that we don't want to remove, but want to create a catch all for that domain. I'd rather not disable RecipientValidation for the entire server as that could cause all sorts of NDRs and backscatter.

Is it possible to add a *@olddomain.com as an email address for a mailbox that could then be considered the catchall? There would be no other user@olddomain.com email addresses defined.
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