
Why does reconstruct -m not work?
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From the reconstruct(8) man page:

   −m     NOTE: CURRENTLY UNAVAILABLE
                Rebuild  the  mailboxes file.  Use whatever data in the existing
                mailboxes file it can scavenge, then scans all partitions listed
                in the imapd.conf(5) file for additional mailboxes.

Reconstruct is currently unable to rebuild the mailboxes db, and
comments on the mailing list indicate this ability will not be added;
at least, not any time soon.

The solution here is to make sure that you back up your mailboxes db,
preferably including a plain-text copy of it. Please see Backups for
more information.

If you do find yourself with a corrupted mailboxes.db, there are a few
things you can try. The first is to see if "db_recover" can recover
your database. If that doesnt' work, there should be backups in
"$CONFIGDIRECTORY/db.backup1" and "$CONFIGDIRECTORY/db.backup2" that
may be OK.

If you're using Simon Matter's RPMs, plain-text copies of the
mailboxes database should be being generated and saved in
"/var/lib/imap/backup". Try rebuilding the db from one of those using
ctl_mboxlist(8). Alternately, try asking the mailing list for help.
