[Dovecot] zlib plugin nad moving mails, bug?

[Nuno Lopes]

This was a bug in version 1.0 which is now corrected in version 1.1.rc6 
by looking at the file header instead of the Z flag.

http://dovecot.org/pipermail/dovecot-news/2008-May/000069.html

Regards,
--
Nuno

Mateusz Kijowski wrote:
> 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
>