Postfix

Mail transfer agent (MTA) for sending email

🐧 Linux🍎 Mac🪟 Windows📋 Quick reference →

Reviewed: 2026-06|Tested on: Kubernetes 1.29 · Terraform 1.8 · Ubuntu 22.04

What is this?

Postfix receives and sends email for your domain — the engine behind most Linux mail servers.

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Config files for Postfix

Where to create or edit the main configuration — paths below match the setup steps.

/etc/postfix/main.cf
Location: Postfix server
Hostname, relay, and mailbox settings

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Step 01

Linux

1sudo apt-get install -y postfix
2# Select 'Internet Site' during install

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Step 02

Linux

1sudo nano /etc/postfix/main.cf
2sudo systemctl restart postfix
3echo test | mail -s 'Test' you@example.com

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Step 03

Linux

1sudo systemctl status postfix
2mailq