mb2md — Converts Mbox mailboxes to Maildir format.
mb2md [-c] [-m] [-d destdir]
mb2md [-c] [-s sourcefile] [-d destdir]
mb2md [-c] [-s sourcedir] [-l wu-mailboxlist] [-R|-f somefolder]
[-d destdir] [-r strip_extension]
mb2md Converts Mbox mailboxes to Maildir format.
-h Show summary of options.
-c Use the Content-Length: headers (if present) to find the
beginning of the next message. Use with caution! Results may
be unreliable. I recommend to do a run without "-c" first and
only use it if you are certain, that the mbox in question
really needs the "-c" option.
-m If this is used then the source will be the single mailbox at
/var/spool/mail/blah for user blah and the destination
mailbox will be the "destdir" mailbox itself.
Directory, relative to the user’s home directory, which is
where the the "somefolders" directories are located. Or if
directory starts with a "/" it is taken as a absolute path,
e.g. /mnt/oldmail/user _OR_ A single mbox file which will be
converted to the destdir.
-R If defined, do not skip directories found in a mailbox
directory, but runs recursively into each of them, creating
all wanted folders in Maildir.
Incompatible with ’-f’
Directories, relative to "sourcedir" where the Mbox files
are. All mailboxes in the "sourcedir" directory will be
converted and placed in the "destdir" directory. (Typically
the Inbox directory which in this instance is also
functioning as a folder for other mailboxes.)
The "somefolder" directory name will be encoded into the new
mailboxes’ names. See the example in the USAGE file (see
This does not save an UW IMAP dummy message file at the start
of the Mbox file. Small changes in the code could adapt it
for looking for other distinctive patterns of dummy messages
Don’t let the source directory you give as "somefolders"
contain any "."s in its name, unless you want to create
subfolders from the IMAP user’s point of view. See the
example in the USAGE file (see below).
Incompatible with ’-R’
Directory where the Maildir format directories will be
created. If not given, then the destination will be
~/Maildir . Typically, this is what the IMAP server sees as
the Inbox and the folder for all user mailboxes. If this
begins with a ’/’ the path is considered to be absolute,
otherwise it is relative to the users home directory.
If defined this extension will be stripped from the original
mailbox file name before creating the corresponding maildir.
The extension must be given without the leading dot (".").
See the example in the USAGE file (see below).
File containing the list of subscribed folders. If migrating
from WU-IMAP the list of subscribed folders will be found in
the file called .mailboxlist in the users home directory.
This will convert all subscribed folders for a single user:
/bin/mb2md -s mail -l .mailboxlist -R -d Maildir
and for all users in a directory as root you can do the
for i in *; do echo $i;su - $i -c "/bin/mb2md -s mail -l
.mailboxlist -R -d Maildir";done
Please read the USAGE documentation (zless
This manual page was written by Noèl Köthe email@example.com for the
Debian system (but may be used by others). Permission is granted to
copy, distribute and/or modify this document under the terms of the GNU
Free Documentation License, Version 1.1 or any later version published
by the Free Software Foundation; with no Invariant Sections, no Front-
Cover Texts and no Back-Cover Texts.