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Here I have defined both the same client and server keys. This means the Sendmail server is able to act as both a client and a server for TLS purposes. Now re-create your sendmail.cf file, and restart Sendmail. You should be able to test if STARTTLS is working using Telnet to connect to port 25 on your Sendmail system. Enter the following: puppy# telnet puppy.yourdomain.com 25 Issue an EHLO anotherhostname to the Sendmail server. This should generate a list of capabilities. If this list includes STARTTLS, then TLS is now enabled for your Sendmail server. Listing 8-8 shows the abbreviated results of this request. Listing 8-8. Checking That STARTTLS Works puppy# telnet puppy.yourdomain.com 25 Trying 192.168.0.1... Connected to puppy (192.168.0.1). Escape character is '^]'. 220 puppy.yourdomain.com ESMTP EHLO testbox 250-puppy.yourdomain.com Hello testbox [192.168.0.10], pleased to meet you 250-STARTTLS

Before you can use your new start page, you have to select it in Visual Studio options. Go into Tools Options then select the Startup node. Select the new custom start page from the Custom Start Page drop-down menu. Close Visual Studio and reopen it. Your new start page should now appear the next time Visual Studio is loaded.

Figure 1-12 The new SmartArt graphics make it easy for you to create professionallooking illustrations. You can create a SmartArt graphic in three easy steps. Choose the type of illustration (list, process, cycle, hierarchy, etc.), select a layout, and enter the text or data in the predesigned art. With just a few clicks, you can create an awesome illustration of designer quality. You ll learn more about SmartArt graphics in 5.

If STARTTLS does not show up in the list of capabilities, the first place to check is your maillog or equivalent mail-logging file. Sendmail will log its TLS-related errors to syslog. For example, if you leave one of your keys or certificates group-readable, then Sendmail will generate the error, like this: Apr 1 18:41:27 puppy sendmail[2923]: STARTTLS=server: file /etc/mail/certs/key.pem unsafe: Group readable file Until you change the permissions to a more restrictive choice (I recommend 0400), then Sendmail will not enable TLS.

To provide an example of how you can use TLS with Sendmail, I will demonstrate how to force Sendmail to require inbound or outbound connections to specific hosts or domains to use encryption By default, because only a limited number of MTAs use TLS, most e-mail transfers are clear text I will assume you need to ensure that connections between specific hosts (for example, if you have two mail servers on different sites connected via the Internet) must send their traffic with encryption To do this, you need to specifically tell Sendmail about those hosts and that they must use TLS How you tell Sendmail involves using the access db feature I discussed the access db feature in 7; refer to that chapter for further information about it and how to enable it One of the possible rules types is using STARTTLS and certificates to allow certain actions.

In this example, I will tell Sendmail to allow a connection to or from my Sendmail server only if the certificate is signed by a trusted CA (for example, the CA created earlier in 3 or a commercial CA) Inside your access db file (I have used /etc/mail/access), you can specify some rules for connections; these rules are TLS_Clt and TLS_Srv Let s look at inbound connections first To insist on encryption from a specific client, you need to add a TLS_Clt rule to your access db The TLS_Clt rule consists of three parts: a name, a requirement, and a flag determining the nature of the error response from Sendmail if the rule is not met The name is the hostname or IP address of the client system, and the requirement is the level of encryption required to allow incoming mail A typical TLS_Clt rule could look like this: TLS_Clt:kitten.

It is worth mentioning the client profile (a cut-down version of the full .NET Framework) aimed at reducing application size and installation time is also used for WPF applications. For more information about the client profile, please refer to 4.