When you are on the internal black list of outlook/hotmail/ the servers will still accept your mail but then either won’t deliver it (srsly?) or put it into the spam-folder of the recipient.
Some messaging via SMTP-status codes would be nice… #email

By nielsk

I am a sysadmin with a background in Japanese Science and economics. Thus my topics are computers, Japan and economics. My favorite past times are pen&paper-role playing games and old video games.

With a couple of friends I also podcast about retro video games in German: Retrozirkel