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This means rather than incorrectly writing to /safe/safe/home/jim/jim.old, Sendmail checks for the extra directory and sees that you have included it in both the alias file and the sendmail.cf file, removes the extra reference, and actually writes to /safe/home/jim/jim.old. The last thing to consider with the SafeFileEnvironment is if you use it in conjunction with the RunAsUser option. Turning on the RunAsUser option will make all deliveries to files or programs unsafe and thus conflicts with the SafeFileEnvironment option. If you use the RunAsUser option, then do not enable the SafeFileEnvironment.

The Grid layout control allows you to define a grid strucure to place individual elements within and is in some ways similar to an HTML table. You will create a 2 x 2 grid and some colored rectangles and then position them within the grid: 1. 2. 3. Right-click the Layout folder and select Add New Item Silverlight User Control. Name it GridTest. Enter the following XAML between the Grid tags (note that the Grid was defined first, and then the Grid.Row and Grid.Column attached properties are added to position the elements): <Grid.RowDefinitions> <RowDefinition Height="150"></RowDefinition> <RowDefinition Height="150"></RowDefinition> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="300"></ColumnDefinition> <ColumnDefinition Width="300"></ColumnDefinition> </Grid.ColumnDefinitions>

DoS and Distributed Denial of Service (DDoS) attacks are designed to overwhelm your mail server by using multiple, simultaneous requests, e-mails, or commands. Eventually your e-mail server uses too much memory, runs out of disk, or spawns too many processes, or your network is overloaded and your system either becomes ineffective or crashes. There is some good news here. You can prevent some of this behavior with some relatively simpleto-implement changes. But (and there are a couple of big buts), you must also be careful when setting this up depending on the volume and throughput of your e-mail server. First, you could risk severely crippling the performance of your e-mail server if you restrict it to a certain number of processes/daemons or a certain volume of e-mail. You should watch your system closely, collect performance data and statistics, and set any thresholds at least 50 percent to 100 percent higher than the peak for that service, rate, or process. This reduces the risk of you artificially denying service to your own e-mail server by setting any limits too low.

You need to keep watching and analyzing this also. Do not assume your e-mail server s performance is going to be static. Watch and adjust your thresholds and limits accordingly.3 Second, you will probably never be able to fully prevent an all-out DoS attack. There is a good chance your mail server will succumb before you get a chance to protect it. What can help with this (or at least enhance your chances of reducing any potential outage because of a DoS attack) is to ensure that you are protecting your e-mail server from DoS attacks in a multilayered fashion. You should ensure your firewalling is correct and that you have the ability to drop connections to hostile sources quickly and effectively (using a tool such as PortSentry).4 I cover some of this in more detail in 2. You should also have earlyresponse warnings set up either by watching performance data and logs or via intrusion detection software such as Snort and alerting via a non-e-mail source!

s This is very important to consider. It is all well and good sending incident warnings and alerts via Tip e-mail until your e-mail server is the target of the attack and you simply are not getting the warnings or they are buried in a sea of other error messages. Look at using SMS or paging as an alternative source of alerts for critical messages related to your e-mail servers and services.

<Rectangle Fill="blue" Grid.Row="0" Grid.Column="0" Width="100" Height="100"></Rectangle> <Rectangle Fill="Red" Grid.Row="0" Grid.Column="1" Width="100" Height="100"></Rectangle> <Rectangle Fill="Yellow" Grid.Row="1" Grid.Column="0" Width="100" Height="100"></Rectangle> <Rectangle Fill="Green" Grid.Row="1" Grid.Column="1" Width="100" Height="100"></Rectangle> 4. 5. Let s add the ability to navigate to this page on the main menu. Open ~/MainMenu.xaml.cs. Add the following code to the MainMenu_Loaded() method: this.cmdGrid.Click += new RoutedEventHandler(cmdGrid_Click); 6. Add the following event handler: void cmdGrid_Click(object sender, RoutedEventArgs e) { PageNavigator.LoadPage(new Layout.GridTest()); } 7. Press F5 to run the application you should see a page like Figure 14-9.