Exchange 2010, Send From Multiple Accounts

In EMC I've set myself up with an addional SMTP email account under the " E-Mail Addresses " tab.  I want the ability to change the from address in outlook to use this new email account but get the following return error . " You can't send a message on behalf of this user unless you have permission to do so " ..    I've tested  the email works when sending from outside to this new email and also when I change the new email to " set as reply "  .....    but can't choose it as an option when sending  " From " ..

any thoughts would help ....

Joel BrownIT DirectorAsked:
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Also you can change the primary smtp if that is what you are after:
Set-Mailbox $user -PrimarySmtpAddress  "newemailaddress"}

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You need to set permissions first before changing send as:
Alexei KuznetsovMicrosoft Outlook MVPCommented:
This is not the way it works. These additional SMTP proxy addresses are for receiving messages only.

To achieve the result you want, you have to create an Exchange contact with that SMTP email and then grant Send As permission for this contact for yourself.
Joel BrownIT DirectorAuthor Commented:
@ Thims ,  
I've gone into EMC under Recipient Configuration and added a new Mail Contact with the SMTP email but don't see where I grant permissions to myself for this.   I've looked under Properties and haven't found anything ....    

Do you have an article which references this ?

Thanks a million .....   Greatly apreciate your help.

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If you at least read my post you would see where and how to do this using the cmdlet

Add-ADPermission "John Simpson" -User "Domain\User" -Extendedrights "Send As"
Joel BrownIT DirectorAuthor Commented:
@ becraig,

Thanks for the information and the great article.    Can the second email be a " Contact " and not another User Mailbox ?  

Thanks for your time ...
Alexei KuznetsovMicrosoft Outlook MVPCommented:
You can use the Active Directory Users and Computers MMC snap-in. Just open Contact's properties and set "Send As" permission on the Security tab.
Is the contact in your domain ?

If not then no you will not be able to.

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Joel BrownIT DirectorAuthor Commented:
THanks for the help
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