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Dhiraj Chatpar
Dhiraj Chatpar

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How to Set Up Your First KumoMTA Server for Email Delivery

#kumomta #email #mta #devops

How to Set Up Your First KumoMTA Server for Email Delivery

KumoMTA is a high-performance, open-source Mail Transfer Agent (MTA) designed for modern cloud infrastructure. Here's how to get started.

Prerequisites

  • Linux server (Ubuntu 20.04+ or CentOS 8+)
  • Domain name with DNS access
  • SSL certificate (Let's Encrypt recommended)

Installation Steps

1. Install KumoMTA 

# Add repository
curl -1sLf 'https://repositories.kumomta.com/gpgkey/kumomta-archive-keyring.gpg' | gpg --dearmor > /usr/share/keyrings/kumomta-archive-keyring.gpg

# Install
apt-get update && apt-get install kumomta
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2. Configure Basic Settings

Edit /etc/kumomta/kumomta.conf:

[server]
bind = ["0.0.0.0:25"]

[logging]
level = "info"
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3. Set Up Authentication

Configure DKIM signing for your domain:

[dkim]
selector = "mail"
domain = "yourdomain.com"
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4. Start the Service 

systemctl enable kumomta
systemctl start kumomta
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Testing Your Setup

Send a test email:

telnet localhost 25
MAIL FROM:<test@yourdomain.com>
RCPT TO:<recipient@example.com>
DATA
Subject: Test Email
This is a test message.
.
QUIT
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PostMTA Advantage

PostMTA provides enterprise-grade KumoMTA hosting with:

  • Managed infrastructure
  • Real-time analytics
  • 24/7 support
  • High availability clustering

Learn more: https://postmta.com

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