Powershell command to update new accepted domain

I have added new accepted domain I would like to update the email address not by EAP I want to do by running command from powershell.  I got the below code from this site. But it is showing error
http://blogs.microsoft.co.il/scriptfanatic/2010/11/22/managing-email-addresses-in-exchange-2010/ 

$mbx = Get-Mailbox
$mbx | Foreach-Object {Set-Mailbox -Identity $_ -EmailAddresses @{‘-’=($_.Alias+’@contoso.com’)}
anyone can help
LVL 30
MAS (MVE)EE Solution GuideAsked:
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SubsunCommented:
@{‘-’=(.. means remove.. Are you trying to remove the email address? Also please post the error.
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Neil RussellTechnical Development LeadCommented:
The command you are running is going to try and remove an email address of
Username@contoso.com from each user.  I thought you wanted to ADD?

Your Set-Mailbox command should be...

Set-Mailbox -identity $_ -EmailAddresses @{Add="$($_.Alias@YourDomain.com")

Replacing YourDomain.com with your new domain name


But it is FAR easier to just add a new policy or update your existing.
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SubsunCommented:
BTB, If you want to replace @some.com email address with @contoso.com then you can try the following code..
$mbx = Get-Mailbox -Resultsize Unlimited
$mbx | %{Set-Mailbox -Identity $_ -EmailAddresses @{Add=($_.Alias+'@contoso.com');Remove=($_.Alias+'@some.com')} -EmailAddressPolicyEnabled:$False}

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MAS (MVE)EE Solution GuideAuthor Commented:
I want to keep both domains and majority of the users are EAP disabled.
i.e. one user will have 2 email address user@olddomain.com and user@newdomain.com
I want to apply this on all users or atleast on EAP disabled users
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SubsunCommented:
$mbx = Get-Mailbox -Resultsize Unlimited 
$mbx | %{Set-Mailbox -Identity $_ -EmailAddresses @{Add=($_.Alias+'@contoso.com')}}

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To add email try above code..
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MAS (MVE)EE Solution GuideAuthor Commented:
I want to do the same for distribution group as well
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SubsunCommented:
Replace *Mailbox commands with *DistributionGroup, I didn't test it but it should work..
$mbx = Get-DistributionGroup -Resultsize Unlimited
$mbx | %{Set-DistributionGroup -Identity $_ -EmailAddresses @{Add=($_.Alias+'@contoso.com')}}

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MAS (MVE)EE Solution GuideAuthor Commented:
Thanks a lot
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