Building a Self-Hosted Email Infrastructure with PostMTA

Want full control over your email sending? Here's how to set up a self-hosted MTA using PostMTA.

Why Self-Host?

• No per-email costs at any volume
• Full control over IP reputation
• Custom bounce handling logic
• Data never leaves your infrastructure

Prerequisites

• Linux server (Ubuntu 22.04 or later recommended)
• 4+ CPU cores, 8GB+ RAM
• Static IP with good sender reputation
• Domain with DNS access

Quick Start

PostMTA provides Docker images for fast deployment:

docker pull postmta/postmta:latest
docker run -d -p 25:587 -v /data:/data postmta/postmta:latest

Essential Configuration

1. DKIM Signing: Generate keys for your sending domains
2. SPF Records: Authorize your PostMTA server IPs
3. DMARC Policy: Set up reporting and enforcement
4. IP Pools: Create separate IPs for different email streams

Production Tips

• Use dedicated IPs, not shared
• Implement proper warmup schedules
• Monitor feedback loops with major ESPs

Get started with PostMTA