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:
and those should work as normal.

However, if a message comes in for anthing else it should go to  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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AkhaterConnect With a Mentor Commented:
here is how to do it

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
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?
AkhaterConnect With a Mentor Commented:
you won't need to do anything with recipient filtering since you don't have Exchange Edge installed
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 * as an email address for a mailbox that could then be considered the catchall? There would be no other email addresses defined.
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