How to Set Up a Postfix Email Server

Basic Installation

# Ubuntu/Debian
apt update
apt install postfix mailutils -y

# CentOS/AlmaLinux
dnf install postfix mailx -y

During installation, select Internet Site and enter your domain (e.g., yourdomain.com).

systemctl start postfix
systemctl enable postfix

Configuring Postfix

Edit /etc/postfix/main.cf:

myhostname = mail.yourdomain.com
mydomain = yourdomain.com
myorigin = $mydomain
inet_interfaces = all
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain

Restart Postfix:

systemctl restart postfix

Testing

echo "Test email body" | mail -s "Test Subject" [email protected]

Check /var/log/mail.log (Ubuntu/Debian) or /var/log/maillog (CentOS) for delivery status.