If you
aren??™t, you must learn Unix elsewhere.
Unix and sendmail Versions
For the most part, we illustrate sendmail under BSD Unix and its variants (suchas
FreeBSD). Where AT&T System V (SysV) differs (such as Sun??™s Solaris 2.x and
Linux) we illustrate those differences.
Our primary focus throughout this book is on V8.14 sendmail. For completeness,
and where necessary, we also discuss V8.13 and earlier (such as BSD??™s version 5,*
IDA, early Sun, Ultrix, and NeXT) but do not cover them in detail in this edition.
Conventions Used in This Book
The following typographic conventions are used in this book:
Italic
Used for names, including pathnames, filenames, program and command
names, usernames, hostnames, machine names, and mailing-list names, as well
as for mail addresses. It also is used to indicate that part of a program??™s output is
not specific. For example, ???error: number or file??? indicates that the error will be
shown either as a number or as a filename. Italic is also used to emphasize new
terms and concepts when they are introduced.
Constant Width
Used in examples to show the contents of files or the output from commands.
This includes examples from the configuration file or other files such as message
files, shell scripts, or C-language program source. Constant-width text is quoted
only when necessary to show enclosed space; for example, the five-character
???From ??? header.
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