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Exchange 2003 Distribution List does not work when sent to from an external address.

We have been using distribution lists for years and they work when you send to them from either an internal address or an external address. Yesterday I created a new list and it only works when you send to it from inside our network. I've made sure that the Message restrictions section on the properties is set to accept messages "from everyone". I've deleted it and created it over again, I've created totally different named lists and they all seem to not work now. But only the new ones, all the old ones are still functioning properly.
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1 Solution
Please make sure that there is no Appliance/Server (Ex: Mail Marshal / Edge Server / Ironport) inbetween Exchange Server and Internet that is accepting mails for your domain. Make sure that the DG information is replicated to that server also.
Let me know
ITDept-CranelAuthor Commented:
Thanks for the reply Nitin. Yes we do have an appliance between the internet and our exchange server. But all other inbound mail is working properly. even other distrubution lists are working. It's only distrubution lists that we added new in the last few days.
ITDept-CranelAuthor Commented:
It actually was our appliance that sits in front of our exchange server. It was not sync'ing with our active directory, and so it was "dropping invalid recipients". Something went wrong on the appliance's end so it was not getting any updates from active directory. I ended up opening a support ticket with the vendor and all is now working properly.

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