docker-mailserver vs Postal
| Tagline | Production-ready, config-driven mail server in a single container | Self-hosted mail delivery platform, a SendGrid/Mailgun alternative |
| Category | Email & Newsletters | Email & Newsletters |
| Replaces | Gmail / Google Workspace | SendGrid |
| GitHub stars | 19k | 17k |
| Language | Shell | Ruby |
| License | MIT | MIT |
| Self-host difficulty | 4/5 Involved | 4/5 Involved |
| Deploy options | Docker Docker Compose Manual | Docker Docker Compose Manual |
| Managed hosting | ||
| Last updated | 11 days ago | 5 days ago |
| View repo | View repo |
Where each falls short
The honest trade-offs — what you give up with each, versus the proprietary tools they replace.
docker-mailserver
- No admin web UI — all config is via files and the CLI
- No bundled webmail or groupware (calendar/contacts)
- Deliverability, DNS, and TLS setup are entirely your responsibility
- Not a newsletter/marketing tool — mailboxes only
Postal
- You are responsible for IP reputation, warmup, and deliverability
- Requires MariaDB, RabbitMQ, and DNS/DKIM configuration to run
- No marketing-campaign UI — it is a delivery engine, not a newsletter builder
- Less hand-holding than managed providers for spam/blocklist issues
Bottom line
Both are a similar lift to self-host; choose docker-mailserver for the larger community and ecosystem. Postal has seen more recent development. Open each guide below for deploy steps and the full feature gap.
docker-mailserver
Production-ready, config-driven mail server in a single container