Mailcow vs Plunk
A detailed comparison to help you choose between Mailcow and Plunk.
Quick Verdict
4.1/5
Mailcow
0 reviews
3.7/5
Plunk
0 reviews
Mailcow is rated higher (4.1 vs 3.7). Mailcow is a free, open source email server suite running on Docker. Complete mail server with anti-spam, anti-virus, webmail, SOGo, and admin panel. Self-host on any VPS. Open-source (AGPL-3.0) email platform for transactional emails, newsletters and automations. Free for 1,000 emails/month, then $0.001 per email; self-hostable via Docker. EU-hosted, SMTP + REST API, unlimited contacts.
Mailcow Self-hosted email server with Docker | Plunk Transactional email infrastructure built for developers | |
|---|---|---|
| Overview | ||
| Rating | 4.1 (0 reviews)✓ | 3.7 (0 reviews) |
| Pricing model | free | freemium: free 1,000 emails/month, then $0.001 per email pay-as-you-go |
| Starting price | Free | Free tier available |
| Best for | Sysadmins and small organisations who want self-hosted, sovereign email on their own server with full groupware, and who can operate a Docker-based mail stack | Indie hackers and SaaS teams wanting one affordable, self-hostable system for transactional email, newsletters and triggered flows — especially EU-based ones |
| Specifications (entry plan) | ||
| CPU cores | 1 vCPU | — |
| RAM | 6 GB | — |
| Storage | 20 GB | — |
| Bandwidth | — | — |
| SLA uptime | — | — |
| Data-center count | — | — |
| €/vCPU/mo | €0.00 | — |
| €/GB RAM/mo | €0.00 | — |
| Features | ||
| IPv6 | ||
| DDoS protection | ||
| Automated backups | ||
| Snapshots | ||
| Managed option | ||
| Bare metal | ||
| GPU available | ||
| S3-compatible | ||
| Hourly billing | ||
| Free tier | ||
| Data-center locations | ||
| Regions | Not applicable — self-hosted; managed mailcow runs in Germany | — |
| Tags | ||
| Tags | free tieropen sourceself hostable | free tieropen sourceself hostableapi access |
| Visit Mailcow → | Visit Plunk → | |
Mailcow
Pros
- + Free GPLv3 suite with the full mail stack (groupware, ActiveSync, Rspamd, ClamAV) — no seats, no volume caps
- + Specific, credible hardware requirements and detailed ops documentation
- + Active monthly release train with prompt security patches (e.g. CVE-2026-33278 fix in May 2026, forced 2FA in March 2026)
- + Vendor-backed escape hatches: shared mailcow from EUR 8.90/mo and managed mailcow from EUR 54.90/mo in Germany
Cons
- - Needs real server management skills (Docker, DNS, PTR, firewall chains, updates)
- - 6 GiB RAM minimum rules out the cheapest VPS tiers
- - IP reputation and deliverability are entirely self-managed on the free tier
- - Community-only support with no SLA behind the open-source software
Plunk
Pros
- + Dead-simple pricing: free at 1,000 emails/month, then $0.001/email with no base fee and per-category spend caps
- + AGPL-3.0 open source with free self-hosting via Docker — full data ownership and an exit path
- + Transactional, campaigns, workflows and inbound email in one product with unlimited contacts on every plan
- + EU-hosted and GDPR-focused, with DKIM/SPF/DMARC configured automatically on custom domains
- + SMTP relay plus a language-agnostic REST API; email validation and real-time analytics built in
Cons
- - No published uptime SLA or deliverability guarantees; sending IP reputation unproven at scale
- - Small team and young product (2022) versus incumbents with a decade of sending history
- - Hosted platform is EU-only; no dedicated IP or managed IP warm-up offering (the DB's IP warming claim is wrong)
- - AGPL-3.0 copyleft matters if you embed the software in a commercial product
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