The T sendmail.cf command* lists those users that are trusted to override the From:
address in a mail message. All other users can have a warning included in the mail
message header.??
Troot daemon uucp
This particular T sendmail.cf command says that there are three users who are to be
considered trusted. They are root (who is a god under Unix), daemon (sendmail usually
runs as the pseudouser daemon), and uucp (necessary for UUCP software to
work properly).
Beginning withV8.10 sendmail, trusted users are also the only ones, other than root,
permitted to rebuild the aliases database.
Trusted users are covered in Chapter 4 on page 154.
1.8.4.11 Keyed databases
Certain information, such as a list of UUCP hosts, is better maintained outside of the
sendmail.cf file. External databases (called keyed databases) provide faster access to
suchinformation. Keyed databases were introduced withV8.1 and come in several
* Th eT command was ignored from V8.1 through V8.6 and restored under V8.7. With V8.7 it is actually
implemented as the class $=t.
?? If the PrivacyOptions option (?§24.9.86 on page 1065) has the authwarnings flag set.
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36 | Chapter 1: Some Basics
forms, the nature and location of which are declared with the K configuration
command:
Kuucp hash /etc/mail/uucphosts
This particular K command declares a database withth e symbolic name uucp, with
the type hash, located in /etc/mail/uucphosts.
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