Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.
Looking for the right ingredients to solve a programming problem? Look no further than O'Reilly Cookbooks. Each cookbook contains hundreds of programming recipes presented in a special Problem/Solution/Discussion format, and includes hundreds of scripts, programs, and command sequences you can use to solve specific problems.
sendmail Cookbook provides step-by-step solutions for administrators who need to solve configuration problems fast. Each recipe outlines a configuration problem, presents the code that solves that problem, and explains the code in detail. The book provides lots of material that doesn't get much coverage elsewhere: STARTTLS and AUTH are given entire chapters, and LDAP is covered in recipes throughout the book. Don't wade through dense documentation to work out custom solutions; just grab a recipe and solve the problem. Sample Chapter 2, Delivery and Forwarding, is available online.
Each recipe is presented in a special Problem/Solution/Discussion format. If you're interested in using a recipe in one of your programs, read our Policy on Re-Use of Code Examples.