gistfile1.txt

# create the namespace "Z-compressed." with the mdbox format
namespace compressed {
  type = private
  hidden = no
  separator = .
  #subscriptions = no
  prefix = Z-compressed.
  location =  mdbox:/home/vmail/%d/%n/compressed
  list = yes
  ignore_on_failure = yes
}

# use compression
mail_plugins = $mail_plugins zlib

plugin {
  # options: gz, bz2, lz4
  zlib_save = gz
  #zlib_save_level = 6
}