Took me 18 hours to learn how to selfhost personal email. 18 minutes to end up on the DBL.

:( I'm bummed out. But I learned a ton.

Installed and configured the following on OpenBSD:
- Crawled my way around the vi Editor
- Webserver
- SLL certificates
- Radicale (Contacts / Calendar)
- Mutt (CLI based e-mail client)
- IMAP Server (dovecot)
- DNS (SPF, DKIM, DMARC)

Incoming and outgoing was working fine for the first 15 minutes from Mutt.
Setup IMAP from my phone, and sent an e-mail to a friend and instantly got hit with this:

This is the MAILER-DAEMON, please DO NOT REPLY to this email. Your e-mail has been blocked bla bla bla.
Checked the Spamhaus Project, and yup! My domain has been added to the Domain Blocklist.

It was still fun and I learned a bunch. Highly recommend it!

EDIT 1: This is not for my personal or professional e-mail hosting. It's just a side project to learn and understand how it selfhosting email works. Thank you all who continue to provide valuable feedback!