Dynamic Distribution Group - Filter Preview shows fewer recipients than listing group members

I have a Dynamic Distribution Group in Exchange 2010. The only recipient filter I've added to it is to exclude mailboxes with a specific custom attribute on them (effectively it is excluding 1 mailbox for my purposes).

From the Exchange 2010 EMC, if I open up the properties of the Dynamic Distribution Group and go to Filter tab and click "Preview", I see the proper recipients (about 250 of them it looks like).

However, if I go to manage this group in OWA, or I run a powershell query with Get-Recipient -RecipientPreviewFilter $GroupName.RecipientFilter, it will list like 900 recipients.

How can I get an accurate report of the recipients? Because I cannot export from the Filter > Preview button.
garryshapeAsked:
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imkotteesSenior Messaging EngineerCommented:
hi, this should help you to export all the members

$members = Get-DynamicDistributionGroup -Identity "dynamicgroupname"
Get-Recipient -RecipientPreviewFilter $members.RecipientFilter > membersall.txt
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garryshapeAuthor Commented:
I tried that but it outputs more members than what I show in the EMC Filter > Preview.

It's odd that members/recipients show up in the command output that don't even exist in the OU that the DDG filter is applying to.

Is this a bug or something because it's not pulling the right recipients from the scope/OU the filter is applying to? Something maybe to do with how the filter may not be applying until an email to the DDG hits the Transport server?
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imkotteesSenior Messaging EngineerCommented:
can you please post the filter over here...
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garryshapeAuthor Commented:
Ok here's one example without even having a recipient filter and output of recipients is inconsistent.

I created a new DynamicDistributionGroup called DDGTest2.

The Filter tab on its properties is set to container domain.com/company, and the following specific types are selected:
"Users with Exchange mailboxes"
"Users with external e-mail addresses".

If I click Conditions tab, nothing is checked.

When I click "Preview" at the bottom of the Conditions tab, all the intended mailboxes appear accordingly, no issues here.

Now if I run the Powershell commands:

$ddg2 = Get-DynamicDistributionGroup "DDGTest2"
Get-Recipient -RecipientPreviewFilter $ddg2.RecipientFilter | select Name,OrganizationalUnit > DDG2_Recipients.txt

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and open the text file output, there are mailboxes from all over AD, not just inside the specified filter container "domain.com/company" but all OUs within "domain.com".

This is why it's confusing to me on how to verify who its going to.
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garryshapeAuthor Commented:
The resolution was to specify the OrganizationalUnit with the get-recipient cmdlet, specifying the same OU that the filter of the DDG was applying to.

So this code:
Get-Recipient -OrganizationalUnit "domain.com/OU" -RecipientPreviewFilter $ddg.RecipientFilter > H:\DDG.txt

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is what worked.

whereas:
Get-Recipient -RecipientPreviewFilter $ddg.RecipientFilter > H:\DDG_No_Ou.txt

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returned results for everyone in the domain even though the Dynamic Distribution Group doesn't "contain" those people via its filter.
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