I haven't found a way to do this in Zimbra and was wondering if it were possible or if there were already a request for this.
I would like to be able to specify that by default, my signature should be included in new messages, but not in replies or forwards. Generally, someone who has sent me a message knows who I am and thus I don't need to include my signature just making the message a lot longer. We also really want this option for our company since a large number of our internal messages are replies and this will save space and make it easier to review "threads". Currently, I am constantly having to either choose to add my signature to new messages or choose to remove it from replies. Neither is optimal.