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my $filename = "";
$filename = $hash{"LIS_FILE"} if($node eq "sam");
...
$mail_server_name = $hash{"MAIL_SERVER"} if($node eq "sam");
$mail_server_name = $hash{"MAIL_SERVER_TEST"} if($node eq "cad2");
chomp $mail_server_name;

my $postfix = '';
if ( $node eq 'cad2' ) {
...
               mail_server_name => 
                    $hash{"MAIL_SERVER${postfix}"}
                };

my ($filename, $htmfilename, 
    $sqt_path, $database_name, 
...
    $$store = $hash{"${attr}${postfix}"};

}

my ($filename, $htmfilename, 
    $sqt_path, $database_name, 
...
        die "Missing required config data: ${attr}${postfix}";
    }
}