[mmorse]

Could you post your amavisd.conf.in?
-I know manage attachments might need some work, so you could put it somewhere like http://pastebin.com/

Also, add your version information to your profile so we don't have to ask all the time in the future (it makes a difference sometimes on what commands we give).
via the command line:

su zimbra
zmcontrol -v

or in the main search bar of the web-client enter:

$set:get version

http://www.zimbra.com/forums/profile.php?do=editprofile > about halfway down the page 'additional information' > zimbra version blank