I just converted over to Zimbra from a qMail/Dovecot/vPopMail/etc. setup. I loved my qMail setup, but there's just no decent standalone calendaring system. Zimbra fits the bill, so here I am.
One feature I'm sorely missing is the ability to rewrite headers. Specifically, I have an email address I use to collect listserv email. Some listservs will include the name of the list in the subject while others do not. I was using procmail to rewrite the Subject: line of those lists that didn't include a list name. I have been unsuccessful, thus far, in identifying a way to do this in Zimbra.
I'm aware that Zimbra uses jsieve, but it would appear that this functionality doesn't exist in jsieve? I also looked, briefly, at possibly using milter to somehow inject maildrop into the mix, but I'm not sure I understand how that works.
Has anyone done this? Can you provide me with information on how to do this?