Most of the Queue processing takes place on the Frontend Servers. Frontend Servers accept incoming SMTP E-mail Messages and either relay them to remote locations or deliver them to local Accounts via Backends, using the special inter-cluster protocol, without placing messages into the Backend Server Queue.
A certain amount of E-mail Messages can be generated directly on the Backend Servers.
They include messages:
You may want to avoid processing Message Queues on Backends for various reasons, including:
You may also want to process Message Queues on some Frontends only.
To specify Queue processing options, open the Settings WebAdmin realm and select the Cluster link on the General page. Find the Queue Processing panel:
Submit Messages: This setting specifies how the composed or received E-mail messages are submitted to the Enqueuer Component for delivery.
Locally for Others:
messages are submitted to the Enqueuer component on the same Server.
The Dynamic Cluster Controller is informed that this Server can accept (enqueue) E-mail messages composed or received with the other Cluster members.
The Dynamic Cluster Controller collects and distributes information about all active Cluster members that have this option selected.