{
    # vim: ft=perl ts=4 sw=4 et:
    # perltidy -pbp
    $OUT = "";

    # ------------------------------------------------
    # if mxbackup is enabled, we have to check if
    # there a 'smart host'. If yes, the smart host
    # should not be used for all 'MX-Backuped' domains.
    # ------------------------------------------------

    if ( ( $mxbackup{status} || "disabled" ) eq "enabled" ) {

        #--------------------------------------------------
        # Now check for SMTP smart host
        #--------------------------------------------------

        if (   $SMTPSmartHost
            && ( $SMTPSmartHost ne 'off' )
            && ( $SMTPSmartHost !~ /^\s*$/ ) ) {
            my %MXValues = split /,/, ( $mxbackup{name} || "" );
            foreach my $data (
                sort {
                    ( join( "\.", reverse( split /\./, $a ) ) )
                        cmp( join( "\.", reverse( split /\./, $b ) ) )
                }
                keys %MXValues
                ) {
                $OUT .= "$data:\n";
                $OUT .= ".$data:\n" if ( $MXValues{$data} );
            }
        }
    }
    chomp($OUT);
}