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DOVEADM-DEDUPLICATE(1)              Dovecot             DOVEADM-DEDUPLICATE(1)

       doveadm-deduplicate - expunge duplicate messages

       doveadm [-Dv] deduplicate [-u user|-A|-F file] [-S socket_path] [-m] search_query

       This  command  is  used  to  expunge duplicated messages in mailboxes.  doveadm deduplicate is mainly useful to
       revert some (more or less) accidental duplication of messages, e.g.  after  doveadm  copy  or  doveadm  import.
       doveadm(1) will delete the newest duplicated messages from the mailbox and keep the oldest.
       Deduplication across multiple mailboxes is not supported.

       Global doveadm(1) options:

       -D     Enables verbosity and debug messages.

       -o setting=value
              Overrides  the  configuration  setting from /etc/dovecot/dovecot.conf and from the userdb with the given
              value.  In order to override multiple settings, the -o option may be specified multiple times.

       -v     Enables verbosity, including progress counter.

       Command specific options:

       -A     If the -A option is present, the command will be performed for all users.  Using this option in combina-
              tion  with  system  users  from  userdb { driver = passwd } is not recommended, because it contains also
              users with a lower UID than the one configured with the first_valid_uid setting.

              When the SQL userdb module is used make  sure  that  the  iterate_query  setting  in  /etc/dovecot/dove-
              cot-sql.conf.ext  matches  your  database layout.  When using the LDAP userdb module, make sure that the
              iterate_attrs and iterate_filter settings in /etc/dovecot/dovecot-ldap.conf.ext match your LDAP  schema.
              Otherwise doveadm(1) will be unable to iterate over all users.

       -F file
              Execute  the  command  for  all the users in the file.  This is similar to the -A option, but instead of
              getting the list of users from the userdb, they are read from the given file.   The  file  contains  one
              username per line.

       -S socket_path
              The  option's  argument is either an absolute path to a local UNIX domain socket, or a hostname and port
              (hostname:port), in order to connect a remote host via a TCP socket.

              This allows an administrator to execute doveadm(1) mail commands through the given socket.

       -m     if the -m option is given, doveadm(1) will deduplicate by Message-Id header.  By  default  deduplication
              will be done by message GUIDs.

       -u user/mask
              Run  the  command  only  for  the  given user.  It's also possible to use '*' and '?' wildcards (e.g. -u
              When neither the -A option, nor the -F file option, nor the -u user was specified, the command  will  be
              executed with the environment of the currently logged in user.

              expunge  duplicates  found from messages matching the given search query.  Typically a search query like
              'mailbox mailbox_name OR  mailbox  other_box'  will  be  sufficient.   See  doveadm-search-query(7)  for

       This example shows how to list and expunge duplicate messages from a mailbox.

       doveadm -f table fetch -u jane 'guid uid' mailbox a_Box | sort
       guid                             uid
       8aad0f0a30169f4bea620000ca356bad 18751
       8aad0f0a30169f4bea620000ca356bad 18756
       923e301ab9219b4b4f440000ca356bad 18748
       923e301ab9219b4b4f440000ca356bad 18753
       doveadm deduplicate -u jane mailbox a_Box
       doveadm -f table fetch -u jane 'guid uid' mailbox a_Box | sort
       guid                             uid
       8aad0f0a30169f4bea620000ca356bad 18751
       923e301ab9219b4b4f440000ca356bad 18748
       a7999e1530739c4bd26d0000ca356bad 18749

       Report  bugs,  including  doveconf  -n  output, to the Dovecot Mailing List <>.  Information
       about reporting bugs is available at:

       doveadm(1), doveadm-copy(1), doveadm-fetch(1), doveadm-import(1), doveadm-search-query(7)

Dovecot v2.2                      2015-05-09            DOVEADM-DEDUPLICATE(1)