For example, mail that is sent via UUCP is a typical application that
requires lists of information:
FU /etc/mail/uuhosts
Here, the external file /etc/mail/uuhosts contains a list of UUCP hosts connected to
the local machine. If the list rarely changes, the F command is appropriate. On the
other hand, if the list is volatile and changes often, the F command has drawbacks.
The file /etc/mail/uuhosts is read only when the configuration file is processed. Any
change to that file is ignored by a running sendmail (suchas the daemon). To make
the change effective, the daemon needs to be restarted.
In suchvolatile situations, storing UUCP information in a database is preferred. A
change to a database is immediately available to the running daemon, eliminating the
need to restart.
V8 sendmail is designed to rewrite addresses on the basis of information looked up in
external databases or in its internal symbol table. It can use a wide variety of database
forms, ranging from ndbm(3) files (?§23.7.4 on page 903) to Hesiod network
database maps (?§23.7.8 on page 909). The K configuration command (?§23.2 on page
882) is used to declare the name, location, and other parameters of databases or to
modify use of its symbol table.
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
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