# Somewhere very visible...
my @autosubs;
BEGIN {
    @autosubs = qw(blacklist floodcheck viruscheck spamcheck headers subject body sender recievers);
}

# At the end of the package...
BEGIN {
    # READ THIS CAREFULLY
    #
    # Auto-magically generate a number of similar plugin register functions without
    # actually writing them down one-by-one. This makes consistent changes much easier,
    # but you need Perl wizardry level +12 to understand how it works.
    #
    # Since *you* don't actually exist at the time of writing (me, cavac, being the only
    # team member), it is *your* fault for not showing up and writing a better solution ;-)

    no strict 'refs'; ## no critic (TestingAndDebugging::ProhibitNoStrict)
    
    # -- Deep magic begins here...
    
    for my $a (@autosubs){
        *{__PACKAGE__ . "::add_$a"} =
            sub {
                my %conf = (
                    Module  => $_[1],
                    Function=> $_[2],
                );
                push @{$_[0]->{plugins}->{$a}}, \%conf;
            };
    }
    # ... and ends here
}