Running your own mail server (MTA) for free is possible, but it comes with significant caveats. While you can set up Postfix, Exim, or OpenSMTPD on a free cloud server, deliverability to major inboxes (Gmail, Outlook, Yahoo) remains the biggest challenge.
These handle MTA, reputation, and deliverability for you. Don't run a free MTA if you need emails to land in inboxes. The time spent fighting blacklists and delivery issues exceeds the cost of a $5/month VPS from Hetzner or DigitalOcean with a clean IP.
| Service | Free Tier Limit | Features | |---------|----------------|----------| | | 5 users, 5GB each | IMAP/POP, webmail | | Cloudflare Email Routing | Unlimited forwards | Catch-all forwarding | | Proton Mail | 1 user, 1GB | Encrypted, custom domain | | iCloud+ | Custom domain with Apple ID | 3 domains, 5 aliases |