Postfix for Ubuntu 24.04 Server

Install Postfix on Ubuntu 24.04 server.

This is not a demo and not an experiment.
No installer prompts, no guesswork — reliable and repeatable mail server deployment.

Why this installer exists

Postfix itself is simple. The interactive installer is not. This avoids incorrect menu selections.

What this installer does

✔ Fully non-interactive setup
✔ Optional mailutils integration
✔ Runs as a proper MTA
✔ Suitable for relay + local delivery
✔ Consistent, repeatable configuration

What this installer does NOT do

It won’t stop you from running the script without reading the documentation like there’s no tomorrow.
Skip the README, and whatever happens next is your headache, not a bug report.

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1. Prepare the system

sudo apt update -y

2. Download the installer

git clone https://git.x-files.dk/mail/postfix-ubuntu.git

cd postfix-ubuntu

3. Run the installer

sudo ./postfixinstall -m <yes|no>

Flags

Option	Meaning
-m yes	Install Postfix + Mailutils
-m no	Install only Postfix

Examples:

sudo ./postfixinstall -m yes    # Postfix + Mailutils
sudo ./postfixinstall -m no     # Pure Postfix only

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2. Service Status

systemctl status postfix
systemctl enable postfix

Send test mail (if Mailutils installed):

echo "Postfix is alive" | mail -s "Test" root@localhost

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3. Default Configuration

Main config file:

/etc/postfix/main.cf

Common values:

myhostname = mail.example.com
myorigin   = /etc/mailname
mydestination = localhost, $myhostname
relayhost =
inet_interfaces = all

Reload config:

sudo systemctl reload postfix

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4. TLS + Certbot Integration (optional)

Recommended additions:

smtp_tls_security_level = may
smtp_tls_loglevel = 1
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt

Apply:

sudo systemctl reload postfix

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5. Useful Commands

List queue:

mailq

Flush queue:

postfix flush

Logs:

journalctl -u postfix -f

Control service:

systemctl stop postfix
systemctl start postfix
systemctl reload postfix

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More Information

More guides and documentation can be found on wiki.x-files.dk

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License

Licensed under the MIT License.

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