Dynamic Distribution Group on HOSTED exchange 2010 not setting up properly

Hi all,
We have a hosted exchange 2010, which prevents us from using the EMC.
I want to create a simple dynamic distribution group for every staff member in the organization but am facing a problem. I use the following command:
New-DynamicDistributionGroup -Organization "organizationname" -IncludedRecipients MailboxUsers -Name "Office"
This appears to work according to shell. In addition,
Get-DynamicDistributionGroup -Organization "organizationname"
DOES come up with "office" as a listing (though the "Managed by" field is empty. Should I care?)
However:
sending to that address creates a bounce-back "no such email address"
a look in AD shows that the object has been created somewhat incorrectly
It appears that while a group is nominatively created no email address is created attached to it (which should be [email protected]).
I am by no means a shell expert and have been bumping my head for a few days now, any suggestion would be great!
Thanks in advance,
Rodolphe

Hey, thanks for your reply Willard.
Everything looks correct:
name: Office
Alias: Office
PrimarySmtpAddress: [email protected]
EmailAddressPolicyEnabled: False
The bounceback now is quoting a permissions issue
#< #5.7.1 smtp;550 5.7.1 RESOLVER.RST.AuthRequired; authentication required> #SMTP#
This actually gives me the clues to resolve:
When creating a distribution group through the EMC, by default it is "closed" so only members of that DDL can send to it. I have tested this by sending to it from an internal address and it does go through.
Set-DynamicDistributionGroup <name> -RequireSenderAuthenticationEnabled $False
resolves the issue to allow external senders.
Thanks for your help Willard, your question was enough to get me going in the right direction. Hopefully some other newbie will find this useful in the future.

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    Kind Regards, Khuzema R.

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