TL;DR: - NO TL;DR: this time, I spent hours writing, you should spend minutes reading. - OK... I explain in WAY TOO MUCH details how to setup a mail server EDIT (2019-10-26) # OpenSMTPD 6.| poolp.org
TL;DR: - SMTP is the way computers exchange e-mails - it is a decentralised protocol meaning that ANYONE can run a node and be independant - it is being centralised at companies that have a history of abuse - it is being centralised in a country that has a history of abuse Where did you read this already ?| poolp.org
TL;DR: - greylisting is a sound idea - yet it is not really practical today - people tend to disable it or find work-arounds - SPF-aware greylisting makes greylisting usable again SMTP failures in a nutshell # SMTP is a fail-safe protocol which attempts very hard to ensure that messages do not get lost once they are in transit.| poolp.org