Configure Exchange email local delivery

We have an exchange 2010 email server and also use postini for email filtering. I want to know how i can configure exchange to send all emails through postini regardless of whether the email is being sent from a local account to another local account. Right now when i use my exchange account to send an email directly to my co-worker, it goes directly into their mailbox, i want that email to go out to Postini first and then come back to the mailbox.

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Alan HardistyConnect With a Mentor Co-OwnerCommented:
You can't send mail that is destined for local delivery outside the server.

When you tell Exchange which Domains it manages, it knows to send the Domains not handled by the server outside of the server and the domains that are 'internal' to itself for delivery.

If you try to send mail that should be destined for local delivery to the outside, then the outside sends it back again, your server won't deliver it and it will be rejected because it thinks it isn't destined for anyone on your server.

If you want all mail sent internally to be sent out of your premises, I would suggest you opt for a hosted solution then ALL mail will be sent externally and then spam filtered / virus filtered.

What is your reasoning behind this request?
If the users are on the same server they will be delivered straight to the mailbox, I know of no way to make e-mails take that extra turn through a spam filter when sending local e-mails.

If you have 2 different e-mail server you could use a filter between them even in a local site, but the same issue would still occur on the local servers.

Why would you want your internal e-mails routed through a filter?
jkpc21Author Commented:
The reason I want to do this is because I am migrating users from our current google apps account to the new exchange email server. I currently have dual delivery setup so mail coming in from the outside is being delivered to both google apps and exchange. However, if i use my exchange account to send an email to another internal employee, and they have not yet been migrated, then they will not get the email because the email goes directly to their exchange mailbox. If the email went out, then it would hit our Postini box and then get routed to both Google and Exchange for those users who have not been migrated.

Is there any other solution i can try to implement to help with this migration. Like i mentioned before, my main concern is users who have not been migrated to exchange will not receive emails sent from the exchange server.
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Alan HardistyCo-OwnerCommented:
The only way I can think of here is to configure Shared SMTP Namespace as per the following article:

This is for Exchange 2007, but pretty much the same as 2010.
jkpc21Author Commented:
We ended up leaving the configuring as is temporarily and went with another solution. We cancelled postini.
jkpc21Author Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for jkpc21's comment #a38515245

for the following reason:

We ended up leaving the configuring as is temporarily and went with another solution. We cancelled postini.
Alan HardistyCo-OwnerCommented:
I told you that you couldn't do what you wanted to do, so as you have gone for an alternative solution, that would suggest that you decided you couldn't do what you wanted to do based on the advice you were given, thus I helped you to answer your question and therefore you should be awarding points for the advice given.

Sometimes the answer to a question is that you can't do what you want to do and that is a valid answer and should be accepted as such.

Objecting to the current intended closure for the above reasons.

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