Ajax in Drupal
The other day needed to use AJAX to implement a feature in Drupal. The main reason to use AJAX was to be able to use caching and still have some content vary slightly on the same page. I could not find a clear answer straight away.
When developing applications in Drupal you need to send mails from time to time. You can configure postfix or another mail server to send mail. Sometimes you can do without, or you do not want to let emails get out of your development machine at all. Imagine yourself working on a site with lots of users and want to test a part of the code which sends mail to users. You do not want to send mail to the users from your development environment. There are several ways to keep your installation from sending mail to users.