I am sure Zimbra supports DKIM filter. And there are instructions to install for RED-HAT.
Does anyone have any source or idea on how to install it in Debian OS.
I followed a tutorial and messed up my configuration. I believe the installation was meant for Postfix, which i believe Zimbra works on.
Setup DomainKeys Identified Mail (DKIM) in Postfix | Debian Tutorials
Did anyone installed before?