Im using the SOAP API to retrieve message information from our Zimbra server.
At the moment Im able to get from, subject, date and a few more fields from a message. However, I cant seem to work out from the documentation how to get for instance the message headers. Could anyone point me in the right direction here?

Here is the request Im using:

<SearchRequest xmlns="urn:zimbraMail" limit="50" offset="1" field="to">

Most thankful for any help!