As per title more or less. The issue we have is that there are about 2000 users across several domains. We want a quick way of setting up a distribution list that can send to all of them. We already have a distribution list with groups as members and those groups containing groups as members until you eventually get down to the user level. That list was created ages ago and has been kept up to date but does not seem to work properly. An email was sent out the other day and it did not go to everyone. People who are in the list did not get the message. If anyone knows how to either make sure our existing dist list works or a quick way of replacing it with something new which does work then I'm interested to hear about it. I have read about creating a distribution list with a mail-enabled security group called 'domain users' - i.e. mail-enable the default group. Not that keen on this idea and have heard it does not work so really not keen on it.

foreach($mbx in Get-Mailbox -Filter { RecipientTypeDetails -eq "UserMailbox"}){Get-Mailbox $mbx.identity | Add-DistributionGroupMember -Identity "All Users"} The above cmdlet can create a DL with name 'All users' with all the users with a mailboxRegards from ExchangeOnline | Windows Administrator's forums

hi, Please Create a Dynamic Distribution Group, the DG will include all users in your exchange ORG. Then you can send message to the DG. How to create you can refer to this link:http://technet.microsoft.com/en-us/library/bb123722.aspx hope can help you thanks,CastinLu TechNet Community Support

Thank you both for your replies. Unfortunately the company is not brave enough to make these changes and we are instead stuck with the labourous task of hashing up a traditional distribution list with nested DLs containing users from various regions. In my opinion a bit of a waste of time and unlikely to be reliable but nobody listens to me!

hi, If you will, please remember to mark as answer to close the thread. thanks,CastinLu TechNet Community Support