I have emails being sent to Zimbra that do not have a To: in the header. There is no fix for this, from the recipient.

When I apply a redirect to these mails, is there any way I can set the To: in header?

I have a specific situation where emails coming in to Zimbra needed to be forwarded on to another program, and that program needs to know which email address the forwarded email was for.

Hope this makes sense!