: 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

<listener smtp> ip 0.0.0.0 port 25 address 0.0.0.0 </listener>

domain gmail.com max-smtp-out 20 throttle-ip 300 # Respect Gmail's IP limits bounce-handler "bounces@yourdomain.com"

You can use telnet or a tool like swaks to send a test email through port 25.