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To further secure Sendmail, you should disable the use of VRFY. This option allows remote users to try to verify the existence of a user address. This can be used to guess valid users on your system. This option is disabled with the noverify feature:
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Another potential security breach is the EXPN option, which expands mailing lists and aliases to their actual addresses. Use the noexpn feature to turn it off:
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By default, Sendmail will refuse mail from any domain that cannot be resolved. You can override this restriction with the accept_unresolvable_domains feature. Sendmail will also reject mail whose addresses do not have fully qualified domain names, host and domain. You can override this feature with accept_unqualified_senders.
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It is not advisable that you modify the sendmail.cf file directly. However, it may be helpful to know how it is set up. This section describes the type of entries you will find there. Table 266 lists the basic Sendmail configuration operators found in the sendmail.cf file. These operators consist of a single uppercase character, some with no spaces separating their arguments. The D operator defines macros. These are often used for specific information, such as the name of a host. The macro name usually consists of one character. Uppercase macro names are reserved for use by Sendmail, whereas lowercase macro names are used for user-defined macros. The following example defines a macro called T for turtle.mytrek.com. You can then reference the macro anywhere in other operations by preceding it with a $, as in $T. To have a macro name longer than one character, encase the name within braces, as shown here for rabbit. To evaluate the rabbit macro use ${rabbit}:
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Operators D C F H O P V K M S R #
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Table 26-6: Sendmail Configuration Operators Action Define a macro. Define a class. Define a class read from a file. Define mail header. Set an option. Set message priority. Specify version level of sendmail.cf file. Specify key file. Specify mailer. Label and start a ruleset. Define a rule. Comment.
Much of the sendmail.cf file consists of options that are specified by the O operator followed by the option and its arguments. For example, the following entries determine the location of the alias file and the maximum size of a message:
O AliasFile=/etc/aliases O HelpFile=/usr/lib/sendmail.hf O MaxMessageSize=1000000
The H operator is used to define mail headers. The P operator is used to define the priority of mail messages based on keywords, such as the term "bulk" in the mail header. The K operator specifies the location of key database files, such as the aliases databases. The C operator is used to define a class, such as a collection of hosts, while the F operator is used to define a class from names read from a file:
# file containing names of hosts for which we receive email Fw/etc/sendmail.cw
The M operator is used to define the mailers used by Sendmail. The S and R operators are used to define rulesets and rewriting rules. Rulesets and rewriting rules are used to determine how a message is to be routed and, if necessary, to rewrite its address so Sendmail's MTAs can handle it. You can think of rulesets as functions in a program, which are called as needed to work on message addresses-and can themselves call yet other rulesets. A ruleset consists of a set of rules, much like a function consists of a set of programming statements. Each ruleset is labeled with a number defined by an initial S operator. The rules making up the ruleset are then defined by R operators. Sendmail uses the rulesets first to format an address into a standard form. Then, for messages being sent, it determines the MTA to use. Special rules called rewriting rules can rewrite the address into a form that can be better handled by the MTA. Rewriting rules consist of a left-hand and a right-hand pattern. An address that matches the pattern on the left-hand side is rewritten in the format of the pattern on the right-hand side.
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