Running your own email server costs $5-40/month in infrastructure: $5-20 for a VPS, $0 for open-source software (Mailcow, Postal), and $0 for SSL (Let's Encrypt). The hidden cost is time — 4-8 hours for setup, 1-2 hours/month for maintenance. At 100K emails/month, total cost is $10/month vs $135-175 on managed ESPs.
How Much Does It Cost to Run Your Own Email Server?
The Infrastructure Costs
Self-hosted email has three cost categories: what you pay monthly, what you pay once, and what you pay in time. For a full breakdown, see is self-hosted email worth it and our VPS comparison.
Monthly Costs
| Component | Cost | Notes |
|---|---|---|
| VPS hosting | $5-40 | Depends on volume needs |
| Domain name | $0-1 | Amortized from annual cost |
| SSL certificate | $0 | Let's Encrypt, auto-renewed |
| Monitoring tools | $0 | Free options sufficient |
| Backup storage | $0-5 | Optional offsite backups |
| Total | $5-45/month |
One-Time Costs
| Component | Cost | Notes |
|---|---|---|
| Domain registration | $10-15/year | If you don't already own one |
| Setup time | 4-8 hours | Your labor |
| IP warmup period | 2-4 weeks | Reduced capacity while warming |
Software Costs
Every major self-hosted solution is free:
- Mailcow: Free, open-source, Docker-based
- Postal: Free, open-source, web UI
- Postfix + Dovecot: Free, Linux standard
- KumoMTA: Free, open-source, high-volume
You pay nothing for the email software itself. This is the fundamental cost advantage over managed ESPs.
VPS Sizing by Volume
| Monthly Volume | Recommended VPS | RAM | Monthly Cost |
|---|---|---|---|
| Up to 50K | Hetzner CX22 | 2GB | €4.90 (~$5) |
| 50K-200K | Hetzner CX32 | 4GB | €8.90 (~$10) |
| 200K-500K | Hetzner CX42 | 8GB | €16.90 (~$18) |
| 500K-1M | Hetzner CX52 | 16GB | €32.90 (~$35) |
| 1M+ | Dedicated or KumoMTA cluster | 32GB+ | $40-100 |
The best VPS providers for email are Hetzner, OVHcloud, and Vultr. Port 25 access is the critical requirement — many cloud providers block it.
Practitioner note: Don't over-spec your VPS. A 2GB Hetzner instance handles 50K/month easily. I see people buying 8GB servers for 10K/month volume "just in case." Start small and upgrade when queue times increase — Hetzner lets you resize without data loss.
Cost vs. Managed ESPs
Here's the comparison that matters — what you'd pay self-hosted vs managed services at each volume:
| Monthly Volume | Self-Hosted | AWS SES | Mailgun | SendGrid | Annual Savings vs Mailgun |
|---|---|---|---|---|---|
| 10,000 | $5 | $1 | $35 | $20 | $360 |
| 50,000 | $5 | $5 | $75 | $90 | $840 |
| 100,000 | $10 | $10 | $175 | $135 | $1,980 |
| 250,000 | $18 | $25 | $225 | $250 | $2,484 |
| 500,000 | $20 | $50 | $275 | $249 | $3,060 |
| 1,000,000 | $35 | $100 | $525 | $450 | $5,880 |
The crossover point where self-hosted becomes cheaper than Mailgun is around 10K/month. Where it becomes meaningfully cheaper (savings exceed time investment): 50K/month.
The Time Cost Nobody Talks About
Infrastructure isn't free just because the software is free. Your time has value.
Setup Phase (One-Time)
- VPS provisioning and OS setup: 30 minutes
- Mailcow installation: 30 minutes
- DNS configuration (MX, SPF, DKIM, DMARC, PTR): 1-2 hours
- Testing and verification: 1-2 hours
- IP warmup: 2-4 weeks of monitoring
Ongoing Maintenance (Monthly)
- Docker container updates: 15 minutes
- Log review and monitoring: 30 minutes
- Backup verification: 15 minutes
- Occasional troubleshooting: 0-2 hours
Total ongoing: 1-3 hours/month in steady state.
At Your Hourly Rate
| Your Hourly Rate | Monthly Time Cost | Annual Time Cost |
|---|---|---|
| $25/hour | $25-75 | $300-900 |
| $50/hour | $50-150 | $600-1,800 |
| $100/hour | $100-300 | $1,200-3,600 |
| $150/hour | $150-450 | $1,800-5,400 |
If you value your time at $50/hour and spend 2 hours/month on maintenance, that's $1,200/year in labor. You still save money if your ESP bill would be $200+/month ($2,400/year).
Practitioner note: The time cost drops significantly after month 3. The first three months are intensive — setup, warmup, learning the system, fixing initial issues. After that, most months are 30 minutes of running updates and glancing at dashboards. I track my time across client servers and it averages 45 minutes/month in steady state.
Break-Even Analysis
Self-hosted breaks even with Mailgun when:
At $50/hour labor cost:
- 50K/month: ESP saves $840/year, labor costs $600/year → saves $240/year
- 100K/month: ESP saves $1,980/year, labor costs $600/year → saves $1,380/year
- 500K/month: ESP saves $3,060/year, labor costs $600/year → saves $2,460/year
At $100/hour labor cost:
- 50K/month: ESP saves $840/year, labor costs $1,200/year → loses $360/year
- 100K/month: ESP saves $1,980/year, labor costs $1,200/year → saves $780/year
- 500K/month: ESP saves $3,060/year, labor costs $1,200/year → saves $1,860/year
Practitioner note: Agencies managing multiple client domains see the biggest wins. One Mailcow server handles 20 domains on a single $10/month VPS. That's $10/month vs 20 separate ESP accounts at $35+/month each. The economics are overwhelming at scale.
If you want exact cost projections for your specific volume and infrastructure needs, schedule a consultation — I'll build a detailed cost model comparing your current ESP spend against self-hosted options.
Sources
- Hetzner: Cloud Pricing
- OVHcloud: VPS Pricing
- Mailgun: Pricing
- SendGrid: Pricing
- AWS: SES Pricing
v1.0 · April 2026
Frequently Asked Questions
How much does a self-hosted email server cost per month?
$5-20/month for the VPS, plus your time. Software (Mailcow, Postal) is free. SSL is free. At 50K emails/month, a $5/month Hetzner VPS handles it. At 500K+/month, budget $20-40/month for a larger VPS.
Is it cheaper to host your own email server?
At 50K+ emails/month, significantly cheaper. Self-hosted costs $5-20/month regardless of volume. Mailgun charges $75-275/month for the same volumes. Annual savings range from $780 at 50K/month to $3,000+ at 500K/month.
What VPS do I need for an email server?
Minimum 2GB RAM for Mailcow handling up to 100K emails/month. 4GB RAM for 100K-500K/month. 8GB+ RAM for 500K+/month. Storage needs are modest — 20GB SSD is enough for most setups. CPU isn't the bottleneck; RAM is.
What are the hidden costs of self-hosted email?
Your time (1-2 hours/month), IP warmup period (2-4 weeks of reduced sending), occasional troubleshooting (blacklist removals, deliverability issues), and the opportunity cost of managing infrastructure instead of your core business.
How much does it cost to send 1 million emails per month?
Self-hosted: $20-40/month (larger VPS needed). AWS SES: $100/month. SendGrid: $450+/month. Mailgun: $525+/month. Self-hosted is 10-25x cheaper than traditional ESPs at this volume.
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