On Fri, Mar 23, 2018 at 04:04:17PM +1300, Richard Hector wrote: > Another reference, thanks. Still not specific.
Let's rewind the discussion. The original context was "why do I need to have a dot in my HELO string". The reason you need a dot in your HELO string is because SMTP receivers may reject you as a spammer (or incompetent, same end result) if you do not have one. That's all. All this academic crap about nodes and empty lists is irrelevant.
