Retrieve PDL Details

Question

Hi,

I need to get the list of all the users who belong to any Distribution List (i.e. PDL).

I need to mention here that I am able to get the details of a group but not the Distribution List.
The email id of a Distribution list (eg. DLName) will be DLName.domainname.com
But the email id of a Group (eg. GROUPName) will be GROUPName.groups.domainname.com

How I retrieve details of  group is:

DirectoryEntry group = new DirectoryEntry("LDAP://companyName.com/cn=GroupUSER_Name,ou=groups,o=companyName.com", null, null, AuthenticationTypes.FastBind);
foreach (object dn1 in group.Properties["member"])
{
   Console.WriteLine(dn1.ToString());
}


This code gives me the detail of all the users who belong to the group called GroupUSER_Name.

What I want to get is the list of all the users who belong to a PDL (Distribution List)

I am able to check if there is any pdl which exists or not. But I am not able to get the list of all the members who belong to the particular PDL.
The LDAP path for the same is:

LDAP://companyName.com/[email protected],ou=Email,ou=Services,o=companyName.com

Could you please help me how to get the details?