=head1 NAME

mailpost - Feed an e-mail message into a newsgroup

=head1 SYNOPSIS

B<mailpost> [B<-hn>] [B<-a> I<addr>] [B<-b> I<database>] [B<-c> I<wait-time>]
[B<-d> I<distribution>] [B<-f> I<addr>] [B<-m> I<mailing-list>]
[B<-o> I<output-command>] [B<-p> I<port>] [B<-r> I<addr>]
[B<-x> I<header>[B<:>I<header>...]] I<newsgroups>

=head1 DESCRIPTION

The B<mailpost> program reads a properly formatted e-mail message from stdin
and feeds it to B<inews> for posting to a news server.  I<newsgroups> is a
whitespace-separated list of group names to which to post the article
(at least one newsgroup must be specified).

Before feeding the article to B<inews>, it checks that the article has not
been seen before, and it changes some headers (cleans up some address
headers, removes X-Trace: and X-Complaints-To:, and puts C<X-> in front
of unknown headers).

If the article has been seen before (B<mailpost> records the Message-ID of
each article it handles), then the article will be silently dropped.  Other
errors will cause the article to be mailed to the newsmaster (selected
at configure time and defaulting to C<usenet>).

Normally, B<mailpost> is run by sendmail(8) via an alias entry:

    local-mail-wreck-bikes: "|<pathbin in inn.conf>/mailpost
        -b /var/tmp -d local local.mail.rec.bicycles.racing"

Instead of F</var/tmp>, the mail spool directory can be specified,
or any other directory where the B<mailpost> process has write access.

=head1 OPTIONS

=over 4

=item B<-a> I<addr>

If the B<-a> flag is used, the value given is added to the article 
as an Approved: header.

=item B<-b> I<database>

If the B<-b> flag is used, then it defines the location of the database 
used to store the Message-IDs of articles sent on.  This is to prevent articles
looping around if a news-to-mail gateway sends them back here.  This option may
be required if the B<mailpost> process does not have write access to the news
temporary directory.  The default value is I<pathtmp> as set in F<inn.conf>.

=item B<-c> I<wait-time>

The B<-c> flag indicates a length of time to sleep before posting.  If
duplicate messages are received in this interval (by any instance of
B<mailpost> using the same database), the article is only posted once, but
with Newsgroups: header modified to crosspost the article to all indicated
groups.  The units for I<wait-time> are seconds; a reasonable value may be
anywhere from tens to hundreds of seconds, or even higher, depending on how
long mail can be delayed on its way to your system.

=item B<-d> I<distribution>

If the B<-d> flag is used, the value given is added to the article as a
Distribution: header.

=item B<-f> I<addr>

The B<-f> flag is a synonym for the B<-r> flag.

=item B<-h>

Print usage information and exit.

=item B<-m> I<mailing-list>

If the B<-m> flag is used, the value given is added to the article in a 
Mailing-List: header, if such a header doesn't already exist.

=item B<-n>

If the B<-n> flag is used, neither an article is posted nor a mail is sent
in case an error occurs.  Everything is written to the standard output.

=item B<-o> I<output-command>

Specifies the program to which the resulting article processed by B<mailpost>
should be sent.  For debugging purpose, C<-o cat> can be used.  The default
value is C<inews -S -h>.

=item B<-p> I<port>

Specifies the port on which B<nnrpd> is listening, used for article posting.
If given, B<-p> is passed along to B<inews>.

=item B<-r> I<addr>

A heuristic is used to determine a reasonable value for the Path: header.
The B<-r> flag indicates what to use if no other value can be determined.

=item B<-x> I<header>[B<:>I<header>...]

A colon-separated list of additional headers which should be treated as
known headers; these headers will be passed through to B<inews> without
having C<X-> prepended.

Known headers are:

    Approved
    Content-*
    Date
    Distribution
    From
    Mailing-List
    Message-ID
    MIME-*
    References
    Return-Path
    Sender
    Subject

=back

=head1 FILES

=over 4

=item I<pathbin>/mailpost

The Perl script itself used to feed an e-mail message to a newsgroup.

=item I<pathtmp>/mailpost-msgid.dir and I<pathtmp>/mailpost-msgid.pag

The default database files which record previously seen Message-IDs.

=back

=head1 HISTORY

Written by Paul Vixie long ago and then hacked up by James Brister for INN 
integration.

$Id: mailpost.pod 7795 2008-04-26 08:28:08Z iulius $

=head1 SEE ALSO

active(5), inews(1), inn.conf(5), nnrpd(8), uwildmat(3).

=cut