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Be careful of not setting your error limits too low and setting your smtpd_error_sleep_time too high in case you slow your system to a halt over minor errors Listing 7-28 Error-Rate Controls in Postfix smtpd_error_sleep_time = 10 smtpd_soft_error_limit = 10 smtpd_hard_error_limit = 20 Recent snapshots of Postfix have included some additional rate-control options This has consisted of an anvil server that allows Postfix to track connection totals from particular clients When this is rolled into the main Postfix release, you should be able to introduce client-based limits for simultaneous connections both in terms of number of connections and numbers of connections per time period If you need this sort of functionality now, then I recommend you.

You created two actions with the same name that were differentiated by GET and POST attributes (covered in the next section). You did not allow a user to save a film with no title because you utilized the Film.IsValid method on the film class. If the film was not valid, you then displayed the returned error messages to the user by using the ModelState.AddModelError(error.Property, error.Description) method.

look at the snapshots of Postfix though I stress that they are experimental, and I do not recommend running a production system on one. Table 7-6. Resource-Control Settings to Stop DoS and DDoS Attacks in Postfix

Controls max size in bytes of a Postfix queue file Controls number of free bytes required in the queue file system to allow incoming mail delivery

The first option controls the size in bytes of any Postfix message queue and therefore any incoming message. You can set this to the limit that bests suits your environment and the policies of your organization. I recommend that you note that SMTP is a mail transfer protocol, not a file transfer protocol. If your users need to send huge files, you should encourage them, if not force them, to seek other means and not to resort to e-mail. The next option is the free space in bytes required in the file system in which your mail queue is contained in order to allow Postfix to accept incoming mail deliveries. I recommend you set this to a multiple of message_size_limit to ensure a single big message does not halt your mail delivery. You can look other variables to further fine-tune your environment. You can see these at http://www.postfix.org/rate.html and http://www.postfix.org/resource.html. Obviously, you need to reload Postfix for any changes you have made here to take effect.

Because you have two Edit ActionResults, you used an attribute to tell ASP.NET MVC to use one method when the page is loaded (AcceptVerbs["GET"]) and another when the user submits data (AcceptVerbs["POST"]). The AcceptVerbs attribute refers to the method in the HTTP protocol that is used when the browser communicates with the server. The use of the AcceptVerbs attribute can assist with making the code a bit neater, but some developers might prefer having a load and edit controller action instead.

Spam, also known as unsolicited commercial e-mail (UCE) or unsolicited bulk e-mail (UBE), and viruses are the major banes of any system administrator s life. The prevalence of both and the scope for potential disaster for your network and users if an infected or spyware e-mail is opened by an unsuspecting user means that anyone who addresses security-hardening issues should also address spam and viruses as threats in their own right. So I will explain a bit about open relaying and how to ensure you are not an open relay and then launch into a breakdown of some MTA-based methods of significantly reducing the volume of spam that hits your servers. I will also cover adding antivirus scanners to both Sendmail and Postfix.

Relaying is the act of an MTA accepting a message from an e-mail client and forwarding that message onto its final destination. Now that sounds like a perfectly reasonable thing for an MTA to do if not part of an MTA s core functionality. When I talk about relaying being an issue, what I am really talking about is open relaying. A system can be described as an open relay if its SMTP server is willing to send mail where neither the sender nor the recipient is local to the machine or local trusted network(s). Also, if the SMTP server is willing to send mail if the sender appears to be a local user but is coming from a nontrusted source such as another network.

mail.yourdomain.com should relay that message because jim is a local user. Unfortunately, from e-mail addresses are ludicrously easy to forge, and thus just because a message says it has come from jim does