Posthaven is great and simple but even greater and less simple (but still simple) is News of the Day (NOTD) who really has the best model for this online posting, newsletter, writing thing.
Here's my site there, go check it out. Yes it costs some money but this keeps the servers running. Also they don't collect data or sell ads or anything like that.
I kinda gave up on NOTD and I can't remember why but go check it out. Gonna start posting there again.