A practical guide to building, tuning, and testing email servers based on sendmail to function more efficiently and resist both accidental and malicious load-related incidents. Based on sendmail 8.12 and earlier versions, the volume covers performance tuning, configuring, and security, with precise directions for managing bottlenecks and load-testing. Annotation copyrighted by Book News, Inc., Portland, OR.
More often than not, the words "sendmail configuration" strike dread in the hearts of sendmail and system administrators--and not without reason. sendmail configuration languages are as complex as any other programming languages, but used much more infrequently--only when sendmail is installed or configured. The average system administrator doesn't get enough practice to truly master this inscrutable technology.Fortunately, there's help. The sendmail Cookbook provides step-by-step solutions for the administrator who needs to solve configuration problems fast. Say you need to configure sendmail to relay mail for your clients without creating an open relay that will be abused by spammers. A recipe in the Cookbook shows you how to do just that. No more wading through pages of dense documentation and tutorials and creating your own custom solution--just go directly to the recipe that addresses your specific problem.Each recipe in the sendmail Cookbook outlines a configuration problem, presents the configuration code that solves that problem, and then explains the code in detail. The discussion of the code is critical because it provides the insight you need to tweak the code for your own circumstances.The sendmail Cookbook begins with an overview of the configuration languages, offering a quick how-to for downloading and compiling the sendmail distribution. Next, you'll find a baseline configuration recipe upon which many of the subsequent configurations, or recipes, in the book are based. Recipes in the following chapters stand on their own and offer solutions for properly configuring important sendmail functions such as: Delivering and forwarding mail Relaying Masquerading Routing mail Controlling spam Strong authentication Securing the mail transport Managing the queue Securing sendmail sendmail Cookbook is more than just a new approach to discussing sendmail configuration. The book also provides lots of new material that doesn't get much coverage elsewhere--STARTTLS and AUTH are given entire chapters, and LDAP is covered in recipes throughout the book. But most of all, this book is about saving time--something that most system administrators have in short supply. Pick up the sendmail Cookbook and say good-bye to sendmail dread.
Reliable, flexible, and configurable enough to solve the mail routing needs of any web site, sendmail has withstood the test of time, but has become no less daunting in its complexity. Even the most experienced system administrators have found it challenging to configure and difficult to understand. For help in unraveling its intricacies, sendmail administrators have turned unanimously to one reliable source--the bat book, or sendmail by Bryan Costales and the creator of sendmail, Eric Allman. Now in its third edition, this best-selling reference will help you master the most demanding version of sendmail yet.The new edition of sendmail has been completely revised to cover sendmail 8.12--a version with more features and fundamental changes than any previous version of the Unix-based email routing program. Because the latest version of sendmail differs so significantly from earlier versions, a massive rewrite of this best-selling reference was called for.The book begins by guiding you through the building and installation of sendmail and its companion programs, such as vacation and makemap. These additional programs are pivotal to sendmail's daily operation. Next, you'll cover the day-to-day administration of sendmail. This section includes two entirely new chapters, "Performance Tuning" to help you make mail delivery as efficient as possible, and "Handling Spam" to deal with sendmail's rich anti-spam features. The next section of the book tackles the sendmail configuration file and debugging. And finally, the book wraps up with five appendices that provide more detail about sendmail than you may ever need. Altogether, versions 8.10 through 8.12 include dozens of new features, options, and macros, and this greatly expanded edition thoroughly addresses each, and provides and advance look at sendmail version 8.13 (expected to be released in 2003).With sendmail, Third Edition in hand, you will be able to configure this challenging but necessary utility for whatever needs your system requires. This much anticipated revision is essential reading for sendmail administrators.
You probably suspect, on some level, that computers might be hazardous to your health. You might vaguely remember a study that you read years ago about miscarriages being more frequent for data entry operators. Or you might have run into a co-worker wearing splints and talking ominously about Workers' Comp insurance. Or you might notice that when you use a computer too long, you get stiff and your eyes get dry.But who wants to worry about such things? Surely, the people wearing splints must be malingerers who don't want to work? Surely, the people who design keyboards and terminals must be working to change their products if they are unsafe? Surely, so long as you're a good worker and keep your mind on your job, nothing bad will happen to you?The bad news is: You can be hurt by working at a computer. The good news is that many of the same factors that pose a risk to you are within your own control. You can take action on your own to promote your own health -- whether or not your terminal manufacturer, keyboard designer, medical provider, safety trainer, and boss are working diligently to protect you.The Computer User's Survival Guide looks squarely at all the factors that affect your health on the job, including positioning, equipment, work habits, lighting, stress, radiation, and general health.Through this guide you will learn: a continuum of neutral postures that you can at utilize at different work tasks how radiation drops off with distance and what electrical equipment is responsible for most exposure how modern office lighting is better suited to working on paper than on a screen, and what you can do to prevent glare simple breathing techniques and stretches to keep your body well oxygenated and relaxed, even when you sit all day how reading from a screen puts unique strains on your eyes and what kind of vision breaks will keep you most productive and rested what's going on "under the skin" when your hands and arms spend much of the day mousing and typing, and how you can apply that knowledge to prevent overuse injuries The Computer User's Survival Guide is not a book of gloom and doom. It is a guide to protecting yourself against health risks from your computer, while boosting your effectiveness and your enjoyment of work.
Introduction to system performance; Monitoring system activity; Managing the workload; Memory performance; Disk performance issues; Network performance; Terminal performance; Kernel configuration.
Covers advanced features of Perl, how the Perl interpreter works, and presents areas of modern computing technology such as networking, user interfaces, persistence, and code generation.
Describes all of the new features of GNU Emacs 19.30, including fonts and colors, pull-down menus, scrollbars, enhanced X Window System support, and correct bindings for most standard keys. Gnus, a Usenet newsreader, and ange-ftp mode, a transparent interface to the file transfer protocol, are also described.
