> > In summary I would like to early block unknowns ie those whose > > source cannot be located. > > If you really want to break SMTP on purpose go on, but i strongly > discourage such nonsense. There is no requirement that a mail > sender needs to have a reverse dns entry.
Aiming for a quiet life Michael. It's my own server and I don't particularly mind if I break any rules discouraging scammers and hackers. In over two years of looking and monitoring logs I haven't seen a SINGLE connection attempt (of the Unknown variety) attributable to anything other than my spammer shadows. I am trying to ensure that I have 'something' in reserve should things develop or snowball. ----best wishes, Robert
