A client of mine sent out an email which was eventually bounced back to him with the reason:
Sorry, I couldn't find any host by that name. (#4.1.2)
I'm not going to try again; this message has been in the queue too long.
In this case, it took a whole week for qmail to bounce the message. I had been under the impression that failure to deliver took 4 days before bouncing took place, per one of the mail RFCs. In either event, the client is concerned over such a long delay, so I wanted to check if the delay is configurable, and if so, what is required to configure it.
Thanks,