Installing PowerMTA (PMTA) 6.0r3 requires a Linux environment—typically AlmaLinux 8/9

—and root access to your VPS. This version includes modern features like improved MSYS/SNI support and enhanced delivery tracking. 1. Pre-Installation Requirements Before starting, ensure your server environment is ready: Operating System

: CentOS 7 is the most common choice, though newer versions support AlmaLinux

: Must be open for outbound mail. You can verify this by running telnet portquiz.net 25 SSH Access : Use a client like Bitvise SSH to access your terminal and SFTP : You need the PowerMTA-6.0r3.rpm package and your 2. Upload and Install the RPM : Move the file to your server’s directory using your SFTP client : Run the following command in your terminal: rpm -ivh PowerMTA- r3.x86_64.rpm Use code with caution. Copied to clipboard : Move your license file to the correct directory: cp license /etc/pmta/license Use code with caution. Copied to clipboard 3. Basic Configuration The main configuration file is located at /etc/pmta/config

. You will need to edit this file to define your basic settings: Postmaster : Set your administrative email address. HTTP Management : Enable the web-based monitor by setting the http-mgmt-port Virtual MTAs : Define your source IP addresses and domain names. Relay Settings

: Configure which IPs are allowed to submit mail to the server. 4. Service Management

Once configured, use these commands to manage the PowerMTA service: Start PMTA service pmta start Check Status service pmta status Start Console (Web Monitor) service pmtahttp start 5. Post-Install Verification Web Monitor : Access the dashboard at

7. Firewall & System Tuning

3.1 Binary Installation

1. The binary package pmta-6.0r3-1.el7.x86_64.rpm was transferred to /root/.
2. Installation executed via RPM:

   rpm -ivh pmta-6.0r3-1.el7.x86_64.rpm
   

3. Default directories created:
   • Config: /etc/pmta/
   • Spool: /var/spool/pmta/
   • Logs: /var/log/pmta/
   • Binaries: /usr/sbin/pmta

9. Firewall and SELinux

• Open port 25:
  • firewalld:

    sudo firewall-cmd --add-service=smtp --permanent
    sudo firewall-cmd --reload
    

  • ufw:

    sudo ufw allow 25/tcp
    

• SELinux: set to permissive or create policies allowing pmta to bind ports and write logs/spool directories.

2.3 Install Required Dependencies

sudo yum install -y wget curl perl-libwww-perl perl-Crypt-SSLeay \
  perl-IO-Socket-SSL perl-Net-DNS perl-Digest-SHA \
  bind-utils tcpdump lsof nc

Virtual MTA example (optional)

<virtual-mta outgoing> <domain *> max-smtp-out 50 </domain> </virtual-mta>

Bind to all interfaces on port 25

smtp-listener 0/0:25

Step 2: Install Dependencies

PowerMTA requires specific libraries to run.

For CentOS/RHEL:

yum install -y perl wget libaio libaio-devel

For Ubuntu/Debian:

apt install -y perl wget libaio1