On 28 Aug 2019, at 21:06, Doug Hardie <bc...@lafn.org> wrote: > Greylisting used to be a very effective approach to spam blocking.
Only if you were very careful monitor your system for the many many corporate sanders where greylist was the effective equivalent of a blacklist (those that did not retry in violation of RFCs and this that had many servers and would resend from different ones). I tried it, but had far too many banks (refuse to resend at all) and mailers like google (many servers, never the same one twice within the greylist window) that I fairly quickly decided it wasn’t tenable. -- Because you can't cotton to evil. No Sir. You have to smack evil on the nose with the rolled-up newspaper of justice and say, 'Bad evil. Bad BAD evil”'
