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In Sendmail to disable VRFY and other SMTP commands, you need to add flags to the confPRIVACY_FLAGS option in sendmail.mc and then rebuild your sendmail.cf. So to disable VRFY in Sendmail, do this: define(`confPRIVACY_FLAGS', `novrfy') Restart Sendmail, and the VRFY command will be disabled. Listing 7-15 shows the results if you try a VRFY with it disabled in Sendmail Listing 7-15. Results from Sendmail with VRFY Disabled VRFY jim 252 2.5.2 Cannot VRFY user; try RCPT to attempt delivery (or try finger) In Postfix you need to add the option in Listing 7-16 to the main.cf file and then reload or restart Postfix. Listing 7-16. Disabling VRFY in Postfix disable_vrfy_command = yes With this option, Postfix should respond similarly to Listing 7-17. Listing 7-17. Results from Postfix with VRFY Disabled VRFY jim 502 VRFY command is disabled

You could use other tools to accomplish the same thing, but in some cases this tool happens to be the most efficient Again, there are other tools, and berdevelopers may look down their noses at FrontPage and use Visual Studio instead Although this is certainly possible, the rest of us will be sitting at a bar somewhere while they manually step through all of the tasks that the Workflow Designer did for us automatically So, marketing focus aside, if you need to work with SharePoint and workflows, you will at one time or another use this tool Whether you are in the IT department; whether you are a power user, administrator, or ber-developer; or if you need to build a basic workflow from preexisting activities and attach it to a single list or document library, you should use this tool.

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workerDoWork += new DoWorkEventHandler(performLengthyOperation); CustomWorkerArgs args = new CustomWorkerArgs(); argsindex = index; argssleepTime = 25000; bwButtons[index]Content = "Cancel"; resultBoxes[index]Text = "Starting.."; workers[index] = worker; workerRunWorkerAsync(args); } } The index is retrieved via the Tag attribute, and then the corresponding worker entry in the workers array is checked This entry is set to null when BackgroundWorker completes (or errors or is cancelled), so if you find it not null, then the worker is active and working Otherwise, a new BackgroundWorker is created This is where we set WorkReportsProgress and WorkerSupportsCancellation to true Again, these properties should be set to true only when you construct the method that does work to explicitly handle the cancel condition and to report progress Next, the event handlers are registered Let s take a closer look at these DoWork is registered with the method that actually does the work.

EXPN stands for expand and allows someone to Telnet to your MTA and query a name. If that name is an alias for multiple recipients, that EXPN command expands that alias into a list of those users. On a Sendmail server using a .forward file, the EXPN command will also show the real forwarding destination of mail. Or you can issue EXPN for the root user and see who receives mail addressed to the system administrator. As you can imagine, this is dangerous both from a security point of view, as attackers can identify a variety of potential user accounts on your system, and from a spam point of view, as spammers can gather considerable numbers of addresses by expanding aliases. As with disabling VRFY, you use the same confPRIVACY_FLAGS option for EXPN. In Listing 7-18 you can see the argument for disabling EXPN added to the confPRIVACY_FLAGS option. Listing 7-18. Disabling EXPN in Sendmail define(`confPRIVACY_FLAGS', `novrfy,noexpn') Rebuild sendmail.cf, and restart Sendmail. When you issue an EXPN, as shown in Listing 7-19, you should see results. Listing 7-19. Results from Sendmail with EXPN Disabled EXPN 502 5.7.0 Sorry, we do not allow this operation

In this case, this is the performLengthyOperation that you already implemented The rest of this method creates a CustomWorkerArgs instance, configures it, and passes it to the BackgroundWorker in the RunWorkerAsync method RunWorkerAsync is what starts the actual work, provided DoWork is registered with the work method The progress handler is straightforward The UserState property of ProgressChangedEventArgs contains the object originally passed to RunWorkerAsync The source of this property, however, is the second (optional) parameter to the ReportProgress method of BackgroundWorker If you need to pass something custom specifically to the progress report handler, you can do it using the UserState property void worker_ProgressChanged(object sender, ProgressChangedEventArgs e) { int index = ((CustomWorkerArgs)eUserState)index; resultBoxes[index]Text = "In progress: " + eProgressPercentage + "%"; } The RunWorkerCompleted event handler is much more interesting Here, you must check whether the background worker was cancelled or if it had an error.

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