schmonz.com is a Fediverse instance that uses the ActivityPub protocol. In other words, users at this host can communicate with people that use software like Mastodon, Pleroma, Friendica, etc. all around the world.
This server runs the snac software and there is no automatic sign-up process.
Running your own mail server with OpenBSD and OpenSMTPD - a great and complete blog post by @mboelen
https://bsd-audit.com/self-hosting/running-your-own-mailserver/
Migrating mail servers from exim to OpenSMTPD (smtpd) is fun and useful https://www.undeadly.org/cgi?action=article;sid=20260516064650 #openbsd #opensmtpd #smtpd #exim #email #smtp #mail #spam #antispam #greylisting #greytrapping #mailmigration
If you are a #postfix user and think what is described in this HOWTO http://www.postfix.org/ADDRESS_VERIFICATION_README.html[1] is useful, I can tell you:
IT IS NOT.
Longer version: https://nxdomain.no/~peter/twenty-plus_years_on_smtp_callbacks_are_still_pointless.html
[1] a more appropriate title would be "Further punishing joejob targets HOWTO"