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       Mail::Filter - Filter mail through multiple subroutines


        use Mail::Filter;

        my $filter = Mail::Filter->new( \&filter1, \&filter2 );

        my $mail   = Mail::Internet->new( [<>] );
        my $mail   = $filter->filter($mail);

        my $folder = Mail::Folder->new( .... );
        my $filter->filter($folder);


       "Mail::Filter" provides an interface to filtering Email through
       multiple subroutines.

       "Mail::Filter" filters mail by calling each filter subroutine in turn.
       Each filter subroutine is called with two arguments, the first is the
       filter object and the second is the mail or folder object being

       The result from each filter sub is passed to the next filter as the
       mail object. If a filter subroutine returns undef, then "Mail::Filter"
       will abort and return immediately.

       The function returns the result from the last subroutine to operate on
       the mail object.


       Mail::Filter->new([FILTER [, ... ]])
           Create a new "Mail::Filter" object with the given filter
           subroutines. Each filter may be either a code reference or the name
           of a method to call on the <Mail::Filter> object.

       $obj->add(FILTER [, FILTER ...])
           Add the given filters to the end of the filter list.

       $obj->filter(MAIL-OBJECT | MAIL-FOLDER)
           If the first argument is a "Mail::Internet" object, then this
           object will be passed through the filter list. If the first
           argument is a "Mail::Folder" object, then each message in turn will
           be passed through the filter list.

           While the "filter" method is called with a "Mail::Folder" object,
           these filter subroutines can call this method to obtain the folder
           object that is being processed.

           If the "filter" method is called with a "Mail::Folder" object, then
           the filter subroutines may call this method to obtain the message
           number of the message that is being processed.


       This module is part of the MailTools distribution,


       The MailTools bundle was developed by Graham Barr.  Later, Mark
       Overmeer took over maintenance without commitment to further

       Mail::Cap by Gisle Aas <>.  Mail::Field::AddrList by
       Peter Orbaek <>.  Mail::Mailer and Mail::Send by Tim Bunce
       <>.  For other contributors see ChangeLog.


       Copyrights 1995-2000 Graham Barr <> and 2001-2007 Mark
       Overmeer <>.

       This program is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.  See

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