I have a proxy setup on postfix that forwards outbound smtp mail to a spam appliance that copies emails to blackberry's and an archival service. This works fine for mail sent through a mail client like outlook/outlook express. However, when sending mail through the webmail interface it doesn't seem to be working, that is blackberry users don't get emails copied to the blackberry went sent from webmail. Does webmail use a different service that may need a proxy or would I do better to just setup forwards through zimbra for this functionality to work ?

Thanks,
Kyle