Software Versions

Most of the examples in this book are taken from Red Hat Linux 7.3 and 8.0, and from Solaris 8. However, the versions of Unix used to create the examples makes very little difference. There are small variations in command output or command-line options, but these variations should not present a problem. sendmail software works the same way from system to system.

Much more important differences are introduced by the version of sendmail. sendmail is constantly evolving. The examples in this book are based on sendmail 8.12, specifically 8.12.9 and 8.12.10. We do not know if the recipes will work exactly as shown on other versions of sendmail, but they should work with minimal adjustments.