Raspberry Pi Full Mail Server

I built a mail server on a Raspberry Pi.

Just one of those “I wonder if I can actually pull this off” projects. Got everything wired up, pointed DNS where it needed to go, opened the right port and it just worked.

I emailed my personal MS365 accounts and Gmail, no rejections. Mail in, mail out, spam filtering doing its job. It felt like one of those rare moments in tech where nothing fights you and everything behaves exactly how it should. heck, I even used it to sign up for a few services I didnt want to link to my personal account haha. I kept it up for 90 days, then spun her down. Keeping power stable, making sure my internet didn’t hiccup, realizing that if my house goes down, so does my mail server. It’s the part that actually matters when it comes to running a server with a service like this.

Fun project, and I learned a ton. Ready for the next challenge in my home lab adventure!

For the technical folks:

• Ubuntu Server 24.04 (Raspberry Pi 5)
• Postfix (SMTP)
• Dovecot (mailboxes/auth)
• Rspamd (spam filtering)
• Certbot (TLS certificates)
• Dedicated public IP + standard mail ports (25/465/587)
• SPF, DKIM, DMARC configured