mailcow: dockerized vs Postal
| Tagline | Dockerized full-stack mail server, a self-hosted Gmail alternative | Self-hosted mail delivery platform, a SendGrid/Mailgun alternative |
| Category | Email & Newsletters | Email & Newsletters |
| Replaces | Gmail / Google Workspace | SendGrid |
| GitHub stars | 13k | 17k |
| Language | PHP | Ruby |
| License | GPL-3.0 | MIT |
| Self-host difficulty | 3/5 Moderate | 4/5 Involved |
| Deploy options | Docker Compose Manual | Docker Docker Compose Manual |
| Managed hosting | ||
| Last updated | 6 days ago | 2 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.
mailcow: dockerized
- Requires a dedicated server with proper DNS/PTR and good IP reputation
- Not a bulk-newsletter tool — focused on mailboxes, not campaigns
- Ongoing maintenance, updates, and spam tuning are on you
- Resource-hungry; needs a few GB of RAM minimum
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
Choose mailcow: dockerized if you want the lower-effort setup; choose Postal for the larger community and ecosystem. Postal has seen more recent development. Open each guide below for deploy steps and the full feature gap.
mailcow: dockerized
Dockerized full-stack mail server, a self-hosted Gmail alternative