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    The following form allows you to view linux man pages.

    Command:

    mmdf

    
    
    

    DESCRIPTION

           This  document  describes the MMDF mailbox format used by some MTAs and
           MUAs (i.e.  scomail(1)) to store mail messages locally.
    
           An MMDF mailbox is a text file containing an arbitrary number of e-mail
           messages.   Each  message consists of a postmark, followed by an e-mail
           message formatted according to RFC822 / RFC2822, followed  by  a  post-
           mark.  The  file  format  is line-oriented. Lines are separated by line
           feed characters (ASCII 10). A postmark line consists of the four  char-
           acters "^A^A^A^A" (Control-A; ASCII 1).
    
           Example of a MMDF mailbox holding two mails:
    
                  ^A^A^A^A
                  From: example@example.com
                  To: example@example.org
                  Subject: test
    
                  >From what I learned about the MMDF-format:
                  ^A^A^A^A
                  ^A^A^A^A
                  From: example@example.com
                  To: example@example.org
                  Subject: test 2
    
                  bar
                  ^A^A^A^A
    
           In  contrast  to  most other single file mailbox formats like MBOXO and
           MBOXRD (see mbox(5)) there is no need to quote/dequote "From "-lines in
           MMDF mailboxes as such lines have no special meaning in this format.
    
           If the modification-time (usually determined via stat(2)) of a nonempty
           mailbox file is greater than the access-time the  file  has  new  mail.
           Many MUAs place a Status: header in each message to indicate which mes-
           sages have already been read.
    
    
    

    LOCKING

           Since MMDF files are frequently accessed by multiple programs in paral-
           lel, MMDF files should generally not be accessed without locking.
    
           Three  different  locking  mechanisms (and combinations thereof) are in
           general use:
    
           ?      fcntl(2) locking is mostly used on recent, POSIX-compliant  sys-
                  tems. Use of this locking method is, in particular, advisable if
                  MMDF files are accessed through the Network File  System  (NFS),
                  since  it seems the only way to reliably invalidate NFS clients'
                  caches.
    
           ?      flock(2) locking is mostly used on BSD-based systems.
    
           the non-blocking variants of the fcntl(2) and flock(2) system calls  in
           order to avoid deadlocks.
    
           If  multiple  methods are combined, an MMDF file must not be considered
           to have been successfully  locked  before  all  individual  locks  were
           obtained. When one of the individual locking methods fails, an applica-
           tion should release all locks it acquired successfully, and restart the
           entire locking procedure from the beginning, after a suitable delay.
    
           The  locking mechanism used on a particular system is a matter of local
           policy, and should be consistently used by all  applications  installed
           on  the  system which access MMDF files. Failure to do so may result in
           loss of e-mail data, and in corrupted MMDF files.
    
    
    

    CONFORMING TO

           MMDF is not part of any currently supported standard.
    
    
    

    HISTORY

           MMDF was developed at the University of Delaware by Dave Crocker.
    
    
    

    SEE ALSO

           scomail(1), fcntl(2),  flock(2),  link(2),  stat(2),  mbox(5),  RFC822,
           RFC2822
    
    
    

    AUTHOR

           Urs Janssen <urs@tin.org>
    
    
    

    Unix February 18th, 2002 mmdf(5)

    
    
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