How to block NDRs from Distribution Lists - Exchange 2003

I have stopped all users (except authenticated) from using a distribution list.  Now I need to make sure that internet users do not get NDR reports from my SBS 2003 / Exchange 2003 server.

We are running Symantec Endpoint 12.1 for email as well, if that is of any help.

thanks,

S.....
svillardiAsked:
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arnoldCommented:
Add a filter based on destination of the distribution list to have NDR captured.
Alternatively,  add an Error-To: alternateaddress to distribution list outgoing emails.
svillardiAuthor Commented:
Can you explain how to do this?
arnoldCommented:
You have to use Server side  filtering....

https://technet.microsoft.com/en-us/library/bb124301%28v=exchg.65%29.aspx

While responding, are you looking for NDRs not to be issued by your server or not resending NDrs that are comming back?
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svillardiAuthor Commented:
Only from a particular distribution list on my exchange server.
arnoldCommented:
Which way is the NDR ?

user a sending email to distribution list,
A recipient of the distribution list has email issues such that their email server send an NDR back. Is this NDR that you do not want to be redistributed?
svillardiAuthor Commented:
No. Internet user sends email. Only domain / authorized users allowed to send to distribution list. I do not want the outside user to know that that the message was refused.
arnoldCommented:
Oh,  not sure you can. without affecting the normal behavior.
Simon Butler (Sembee)ConsultantCommented:
The internet sender must be using the SMTP address. Internal uses will not.
Therefore lift the SMTP address off the group and put it on another one, with no members. Allow that group to be emailed from the outside world. Then place a new SMTP address (for internal use only) on to the original group. The group will still work in the same way internally, but externally emails send to the SMTP address will go in to a black hole.

Simon.

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svillardiAuthor Commented:
Interesting workaround.  Thanks.  I'll try it.
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Windows Server 2003

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