Describes why having register_globals enabled on a webhosting server can be a security issues. An important PHP script should value its own security and a good place to start is with register_globals and how variables are handled within the script.

Discusses some of the problems with a lot of larger companies that are causing sender callouts to fail. Some large companies are using tactics that are very similar to those that spammers use, which is causing their messages to be treated as spam.