DMAIL(1)                   OpenBSD Reference Manual                   DMAIL(1)



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)
