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To tell Sendmail about the SASL capabilities available to it, you need to define some options in your sendmail.mc file. Add the two lines from Listing 8-21 to your sendmail.mc file. Listing 8-21. Enabling SASL in Sendmail define(`confAUTH_MECHANISMS', `PLAIN LOGIN') TRUST_AUTH_MECH('LOGIN PLAIN')

The first line defines the list of mechanisms that are available to Sendmail to authenticate a connection. In this instance, I have specified only PLAIN and LOGIN. The second line is a class that further refines this list into those mechanisms that allow relaying; again, in this case, they are PLAIN and LOGIN. This class can be a subset of the AUTH_MECHANISMS list or the same list. You can also define the AUTH_OPTIONS parameter. This allows you to control and tune your Sendmail authentication options. Add this line to your sendmail.mc file: define(`confAUTH_OPTIONS'. `options') options is one of a string of characters that changes the way authentication functions are performed. In Table 8-7 you can see a list of some of the more useful parameters. Table 8-7. AUTH_OPTION Options

Provides protection from active attacks during authentication exchange. Does not permit anonymous mechanisms. Does not permit mechanisms that are vulnerable to dictionary attacks (in other words, LOGIN and PLAIN). Does not permit mechanisms that are vulnerable to dictionary attacks (in other words, LOGIN and PLAIN, unless TLS is activated). Fixes from broken MTAs that do not abide by the RFC. This is needed only if you using Sendmail as an SMTP AUTH client.

Silverlight 3.0 allows you to create styles that inherit from another style (sort of like CSS) by specifying a parent style in the BasedOn property. The following code creates a style inheriting from MyHorridFuciaStyle: <Style x:Key="HybridStyle" TargetType="Button" BasedOn="{StaticResource MyHorridFuciaStyle}"></Style>

For example, I recommend you set the AUTH_OPTIONS flags to at least the following: define(`confAUTH_OPTIONS'. `a y p A') The use of the p option means you must have TLS running in Sendmail as well; otherwise, you will be not be able to authenticate with SMTP AUTH. Re-create your sendmail.cf file with these options configured, and you should now have SMTP AUTH and SASL working. To check this, try the commands in Listing 8-22 to see if your Sendmail server responds to an EHLO with the availability of the AUTH command. Listing 8-22. Checking SMTP AUTH Is Available in Sendmail 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 kitten 250-puppy.yourdomain.com Hello kitten [192.168.0.2], pleased to meet you 250-AUTH LOGIN PLAIN 250-STARTTLS You can now test SMTP AUTH using the client of your choice. I will show you how it works with Outlook Express in the Testing SMTP AUTH with Outlook Express section.

You can also use SASL in Sendmail to provide SMTP AUTH authentication between servers. In this model, your Sendmail server acts as a client of another MTA. This relies on you having suitable credentials stored on your Sendmail MTA to authenticate you to the remote server. Sendmail can store those credentials either in the access database or via the authinfo file. I recommend you use the authinfo file, as this gives you the ability to separate entries that require higher security from your more general access database, which a number of users might see. To enable authinfo, add the following line to your sendmail.mc file: FEATURE(`authinfo') This will create an entry in your sendmail.cf file when you re-create it using m4, which looks like this: Kauthinfo hash /etc/mail/authinfo You need to create this authinfo database. Place your authentication entries into a file, call it authinfo, and then makemap it into a hash database or the database of your choice. The authinfo entries follow a simple structure of two columns. The left column contains the AuthInfo statement followed by the domain, host, or IP address of the remote server being authenticated to, separated by a colon. The right column contains a list of configuration items, each quoted and separated by a space. Table 8-8 lists them. The two columns are separated by tabs or one or more spaces. Table 8-8. authinfo Configuration Items