A message sent to a distribution list is delivered to all users that belongs to that DL; this is standard Exchange behaviour, and there's no way (at least that I know of) to avoid it.
You can set up a rule in Outlook to automatically move it to a different folder or plainly delete it, though.
I will tell you the way i have done this on my Exchange 2010, hoping it will also work for your Exchange 2013.
You absolutely need Powershell (Exchange Management Shell) to create the DDL :
New-DynamicDistributionGroup -Name "group1_DDL" -RecipientFilter {MemberOfGroup -eq "CN=Group1,OU=myOU,DC=domain,DC=local"} -RecipientContainer "OU=Users,OU=Account,DC=domain,DC=local"
Main points here are :
- You need to use the OPATH filter attribute
MemberOfGroup :
For this value you need to put the full DN of your AD Group.
- You need to specify the
RecipientContainer parameter :
This is the full DN where your AD users are stored.
Some explanations :
- You need to use OPATH Filters for the
RecipientFilter so that you can use the MemberOfGroup attribute. The standard memberOf attribute exposed by Exchange will not work because you need a calculated back-link property from AD :
MemberOfGroup filtering requires that you supply the full AD
distinguished name of the group you're trying to filter against. This
is an AD limitation, and it happens because you're really filtering
this calculated back-link property from AD, not the simple concept of
"memberOf" that we expose in Exchange.
- OPATH Filters are supported for the
RecipientFilter parameter :
https://technet.microsoft.com/en-us/library/bb125127(v=exchg.150).aspx
RecipientFilter : The RecipientFilter parameter filters the mail-enabled
recipients used to build the dynamic distribution group. [...] The
RecipientFilter parameter uses OPath syntax to query Active Directory
and filter recipients.
http://exchangepedia.com/blog/2007/02/memberof-attribute-can-now-be-used-in.html :
Unlike LDAP filters, the actual attribute name - memberOf is not used
in OPATH filters. The filterable property name for OPATH filters is
MemberOfGroup.
- By default (means not specified), the
RecipientContainer will be
the standard Users DN : CN=Users,DC=domain,DC=local. So when
Exchange performs its query to determine membership, it can only see
members that are in this OU.
This is the reason why you need to specify the OU where your AD Users are actually stored.
Finally, here is the link to the ressource that makes me able to make this work, and from i get most of the reference above :
https://exchangemaster.wordpress.com/tag/recipientcontainer
Best Answer
I found a way to do this, which wasn't obvious to me since I was only using the Exchange Admin Center tool.
After creating the group in the above mentioned tool I tehn went into Active Directory Users and Groups and looked at the group. The person I had added as the owner in the Exchnage too (but not as a member) was listed as a member here. I removed them from the Member list but kept them as the owner. Now emails to this group do not go to the group owner.