NAME

       dmail - procmail Mail Delivery Module

SYNOPSIS

       dmail [-D] [-f from_name] [-s] [-k keyword_list] [user][+folder]

DESCRIPTION

       dmail  delivers  mail  to  a  user's  INBOX or a designated folder.  dmail may be configured as a drop-in
       replacement for binmail(1), mail.local(1) for use with a mail delivery filter such as procmail(1).

       Because of security considerations (see below) dmail is not intended to be used for  direct  delivery  by
       the  mailer  daemon; tmail(1) is the preferred tool for this purpose.  If dmail is used for mailer daemon
       delivery, the mailer daemon must invoke dmail with the dmail process' user id set to the recipient's user
       id.

       When  dmail exits, it returns exit status values to enable procmail(1) to determine whether a message was
       delivered successfully or had a temporary (requeue for later delivery) or permanent  (return  to  sender)
       failure.

       If the user name is present, it must be the same as the logged-in user name.

       If  the  +folder  extension  is  included  in the user argument (or appears by itself if there is no user
       argument), dmail will attempt to deliver to the designated folder.  If the folder does not exist  or  the
       extension  is not included, the message is delivered to the user's INBOX.  If delivery is to INBOX and no
       INBOX currently exists, dmail will create a new INBOX.  dmail recognizes the format of an existing  INBOX
       or folder, and appends the new message in that format.

       The -D flag specifies debugging; this enables additional message telemetry.

       The -f or -r flag is used to specify a Return-Path.  The header
          Return-Path: <from_name>
       is prepended to the message before delivery.

       The -s flag specifies that the message will be flagged as being "seen".

       The  -k  flag  is used to specify delivery keywords, which are set on the message at delivery time if and
       only if the keywords are already defined in the mailbox.  Multiple keywords can be specified by  using  a
       quoted string, e.g.,
          dmail -k "$Junk Discard" +junkbox

RESTRICTIONS

       Absolute pathnames and ~user specifications are not permitted in +folder extensions.

SECURITY CONSIDERATIONS

       Unlike  tmail  you  can use dmail to deliver to IMAP4 namespace names via +folder extensions.  This means
       that it is possible to deliver to mh(1) format mailboxes.

       However, this can also include such namespaces as #shared, #public, and  #ftp.   In  most  cases,  it  is
       undesirable  to  allow  anybody  sending  mail to the user to deliver to these namespaces.  Consequently,
       there needs to be a rule in place in the configuration of either sendmail(8) or  procmail(1)  to  prevent
       such abuse.

AUTHOR

       Mark Crispin, MRC@CAC.Washington.EDU

SEE ALSO

       binmail(1)
       procmail(1)

                                                  June 18, 2007                                         DMAIL(1)