I'm missing X-Original-To header in incoming messages. This should be standard Postfix feature, enabled by default, as I've seen in Postfix documentation. To be sure, I have added entry to /opt/zimbra/postfix/conf/main.cf (enable_original_recipient = yes), but it did not work. Am I missing something?

I'm not experienced in Linux nor Zimbra, but I decided to give it a try and so far I am impressed by quite smooth install and its features.