2004-04-16 07:41:05 recipients from [218.84.71.28] refused (failed to find host name from IP address)
I had always thought that it meant that it had failed because it couldn't resolve the reverse name of the IP... and I thought "that's not RFC compliant - so why is it enforcing it?"
Looking at the logs just now, I realised that it merely means that it failed (for some other reason), and when it tried to log the reverse name it couldn't resolve it... so it wrote "failed to find hostname..." where it would have normally logged the hostname... perhaps it should just put "could not resolve" or something which doesn't have the word "failed" in it...
