I am trying to get the new QuotaClone plugin in Dovecot (2.2.18) working. The documentation says the configuration should be like this:

mail_plugins = $mail_plugins quota quota_clone
plugin {
  quota_clone_dict = redis:

However, it does not say anything about the configuration file this should be in, so I assumed 20-lmtp.conf and 90-quota.conf are the appropriate locations. The Dovecot example immediately returned the following error "Error: quota_clone_dict: Failed to initialize 'redis:': dict redis: Unknown parameter: 6379".

After looking at the plugin code and the redis dict code, I changed it to the configuration below. It does not return any error now, but it does not work either (tcpdump shows no packages going to Redis).


plugin {
  quota = maildir:User quota
  quota_clone_dict = redis:host=


protocol lmtp {
  postmaster_address = [email protected]
  mail_plugins = $mail_plugins quota quota_clone

I know the Quota Clone plugin is quite new, but maybe someone got it working already and can share some knowledge with me?

  • I'm having the same problem with mysql and quota_clone_dict. Any news here?
    – basbebe
    Jan 12, 2016 at 17:21
  • Possible explanation: "quota_clone does not do anything unless quota is doing something" as answered here.
    – anx
    Apr 19, 2019 at 13:13

1 Answer 1


Redis server should be described as

quota_clone_dict = redis:

  • As stated in my post, that returns an error. Besides that, there is a difference between the docs and the actual code.
    – Jeroen
    Sep 3, 2015 at 14:26
  • So you have to dig into code, sorry.
    – Kondybas
    Sep 3, 2015 at 14:38

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