[Dovecot] zlib plugin nad moving mails, bug?

[Mateusz Kijowski]

Hi,


Recently I gzipped mails older than 30 days in our users' maildirs. I used 
find and gzip. Gzip added 'Z' at the end of the filename and everything 
seemed to work fine, users did not notice any difference in performance 
(yet :-), and I saved about 30% of our mail storage space.

There seems to be a problem when moving gzipped messages from one folder to 
another though. Dovecot drops the Z flag, moved messages are not processed by 
the zlib plugin and email clients end up showing garbage.

Is there something wrong with my config, or did I encounter a bug?

dovecot -n follows:

# 1.0.13: /etc/dovecot/dovecot.conf
base_dir: /var/run/dovecot/
log_path: /var/log/dovecot.log
protocols: imap imaps pop3s
ssl_ca_file: /etc/certs/certum-chain.crt
ssl_cert_file: /etc/certs/wild.dfqs.pl.crt
ssl_key_file: /etc/certs/wild.dfqs.pl.key
ssl_cipher_list: ALL:!LOW:!MEDIUM
login_dir: /var/run/dovecot/login
login_executable(default): /usr/lib64/dovecot/imap-login
login_executable(imap): /usr/lib64/dovecot/imap-login
login_executable(pop3): /usr/lib64/dovecot/pop3-login
login_greeting: imap.dfqs.pl ready.
login_process_per_connection: no
login_processes_count: 5
login_max_processes_count: 32
max_mail_processes: 4096
verbose_proctitle: yes
mail_location: maildir:~/mail:INDEX=/var/lib/dovecot/indexes/%Ln
mail_debug: yes
maildir_copy_with_hardlinks: yes
maildir_copy_preserve_filename: yes
mail_executable(default): /usr/local/lib64/dovecot-post-login-imap.sh
mail_executable(imap): /usr/local/lib64/dovecot-post-login-imap.sh
mail_executable(pop3): /usr/local/lib64/dovecot-post-login-pop3.sh
mail_plugins(default): imap_quota trash quota acl zlib
mail_plugins(imap): imap_quota trash quota acl zlib
mail_plugins(pop3): quota
mail_plugin_dir(default): /usr/lib64/dovecot/plugins/imap
mail_plugin_dir(imap): /usr/lib64/dovecot/plugins/imap
mail_plugin_dir(pop3): /usr/lib64/dovecot/plugins/pop3
mail_log_max_lines_per_sec: 0
imap_client_workarounds(default): outlook-idle tb-extra-mailbox-sep
imap_client_workarounds(imap): outlook-idle tb-extra-mailbox-sep
imap_client_workarounds(pop3): outlook-idle
pop3_uidl_format(default):
pop3_uidl_format(imap):
pop3_uidl_format(pop3): %08Xu%08Xv
pop3_client_workarounds(default):
pop3_client_workarounds(imap):
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
namespace:
  type: private
  separator: /
  inbox: yes
namespace:
  type: public
  separator: /
  prefix: Public/
  location: 
maildir:/var/vmail/Public:CONTROL=~/Public/control:INDEX=~/Public/index
namespace:
  type: shared
  separator: /
  prefix: Shared/
  location: 
maildir:/var/vmail/Shared:CONTROL=~/Shared/control:INDEX=~/Shared/index
auth default:
  verbose: yes
  debug: yes
  worker_max_count: 512
  passdb:
    driver: pam
    args: dovecot
  userdb:
    driver: ldap
    args: /etc/dovecot/dovecot-ldap.conf
  socket:
    type: listen
    client:
      path: /var/run/dovecot/auth-client
      mode: 432
      user: root
      group: vmail
    master:
      path: /var/run/dovecot/auth-master
      mode: 432
      user: root
      group: vmail
plugin:
  quota: maildir:storage=12582912:ignore=Trash
  acl: vfile:
  trash: /etc/dovecot/dovecot-trash.conf
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