Exchange 2010 send as

I need to allow a user to send as an email address that doesn't exists in our organization. How do I do this?
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David11011Asked:
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Will SzymkowskiSenior Solution ArchitectCommented:
Send As is an Active Directory permission. If you want to send as another user from a different Forest you need to have a Forest trust enabled, along with having the "Send As" permission assigned to your account on the User you want to send as from the trusted Forest.

Will.
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David11011Author Commented:
I don't to send from another forest. I just want to send from an arbitrary address.
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Will SzymkowskiSenior Solution ArchitectCommented:
If you have Exchagne 2010 do the following...
- Open EMC
- Expand Organizational Configuration
- Click Hub Transport
- Click Accepted Domain Tab
- Create an Accepted domain (@toys.com)
- Remove the check box for "Automatically update via email address policy"
- Assign a user the new email address (@toys.com) set it as primary STMP

Note: You can also create a new Email Address Policy if you want to distribute this to many users rather than doing it manually.

The last step is done from the Users properties in Exchange.
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David11011Author Commented:
Ok. so we send out email blasts from our mailserver in Idaho for two different companies.
Collision services and IDEA.

We are wanting to send emails from the IDEA mailserver from the address sales@collisionservices.com. so that when people reply to the emails the emails will be received by the collision services email server over in Iowa.

The problem with created a user account on IDEA's domain and giving it the email address of sales@collisionservices.com is that now when anyone at IDEA sends an email to that address it sends to the mailbox and IDEA and not to the Collision Services mailserver.

This worked without any problems on Exchange 2003. We upgraded to Exchange 2010 over the weekend and now it's not working.
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Will SzymkowskiSenior Solution ArchitectCommented:
That is correct. When you create an accepted domain in Exchange mail will only route internally because it thinks you are hosting the mail for that domain. What you are looking for requires Exchange Internal Relay Domain. You could also try using an External Relay Domain as well. Rather than using an Authoritative Domain.
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David11011Author Commented:
Then would i have to configure the collision services to allow IDEAs mailserver to relay off of it?
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Will SzymkowskiSenior Solution ArchitectCommented:
That is correct. You are probably going to want to use Internal Relay Accepted Domain.

See this article for more detail on how to set it up correctly. You also need to create a send connector as well.

http://technet.microsoft.com/en-us/library/bb676395(v=exchg.141).aspx
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David11011Author Commented:
well that stinks. The whole purpose of this task was to take some of the load off of collision services mail server.
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Will SzymkowskiSenior Solution ArchitectCommented:
You either accept mail for a specific domain and hold the mail on prem or relay it to another Exchange environment.
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David11011Author Commented:
Thanks for your help
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