Postfix Mail Server Nodes

A Postfix mail server node is a server (Linux-based) that uses the Postfix mail transfer agent for mail delivery. When you subscribe a customer to a plan that includes mail hosting service, the system creates customer's mailboxes on one of the Postfix mail server nodes.

When you assign the Postfix mail server role to a node, the system automatically installs the Postfix software to that server.

Server Requirements

Before adding a mail server node to the environment, make sure that the server meets the following requirements.


RHEL 5.9, 6.4 (32-bit or 64-bit)

CentOS 5.9, 6.4 (32-bit or 64-bit)

CloudLinux 6 (32-bit or 64-bit)


2 GHz minimum, 3.2 GHz recommended


1 GB minimum

Disk space

At least 1 GB free

Open TCP ports

SMTP and POP3: TCP ports 25, 110

Mail submission: TCP port 587

IMAP: TCP port 143

Secure POP: TCP port 995

Secure SMTP: TCP port 465

Secure IMAP: TCP port 993

Communication between a service node and PA panels: TCP ports 8352-8999

Communication through SSH: TCP port 22

Important: You must disable SELinux on a service node before adding it to the environment. Enabling SELinux after deployment will result in your PPA installation malfunctioning. To learn how to disable SELinux, please refer to the manuals provided for the OS installed on the node.

Adding a Node

To register a mail server node in PA:

  1. Add a mail server node to PA by starting the Add New Node wizard in Administration Panel > Infrastructure > Service Nodes. The wizard will ask you to provide the following information:
  2. Normally, when the installation is complete, the node is marked as Ready to provide its services. If this does not happen, resolve the issue and mark it manually on the node properties page (Infrastructure > Service Nodes).
  3. Assign a license key to the node as described in the section Installing License Keys for Service Nodes.
Automatically Assigned Attributes

When registering a Postfix mail server node, the system automatically assigns the Postfix provisioning attribute to the node.


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