daemontools is a collection of free tools for managing Unix services, developed as an improvement to inittab, ttys, init.d or rc.local.
The software can be downloaded from D. J. Bernstein’s website:
Bouncing mail messages is generally being frowned upon. Often, people believe bouncing is a good way to give spammers the finger. Unfortunately, the sender address is easily forged. So, most of the times, the bounced message ends up in the mailbox of an innocent bystander whose mail address has been misused as the sender address in a spam run. Qmail specifically has a bad reputation for firing off these bounces, generally referred to as scatter.
Of course, there are legitimate reasons to bounce messages. For example, when you want people to know an e-mail address is no longer in use. Qmail offers its users the
bouncesaying command, allowing them to bounce messages delivered to a specific address (or alias). Adding conditional checks allows us to do so with more granularity.