I am trying to retrieve the list of users in a distribution list.
So far I was working out the following SOAP request to be sent to the server:

<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope">
<context xmlns="urn:zimbra">
<sessionId id=".....">.....</sessionId>
<SearchDirectoryRequest xmlns="urn:zimbraAdmin" 
offset="0" limit="2000" 
sortBy="name" sortAscending="1" 
<query xmlns="">zimbraMailAlias=it@example.com</query>
The problem is, that this returns in the SOAP response also the aliases which are defined for users.
Could anybody give me a hint how to modify the query to get only "objectClass=zimbraAccount"?