MPP Postfix Policy Server Tips
MPP has a powerful policy server for Postfix that is unique in its integration with a post-queue content filter. The integration of pre-queue policy decisions and post-queue processing capabilities distinguish our policy server implementation. The following are a few guidelines for configuring and using our policy server.
1) Beginning in version 3.4 we added a dynamic thread allocation model to the Postfix Policy Server. It is critical to implement this threading model to respond to SMTP bursts, otherwise there may not be enough threads available to process policy queries. Here are the commands that are necessary to enable dynamic threading, they are available n the GUI or can be added manually to the common section of mppd.conf.xml. Add with lt/gt signs, which this blog software leaves out.
policy_threads_min 1
policy_threads_max 120
These commands are not currently in the GUI, but will be added soon.
2) The policy-server can be configured as a standalone element or alongside your mpp instance. You can control the location the policy server in the policy-server socket configuration section of the GUI.
3) The policy-sever works with our thresholds and auto-blacklists - you should use these features to stop repetitive spammers or email flooders.
4) We have a new action of defer for threshold violations which the policy-server supports in order to regulate the flow of inbound email for chatty remote smtp servers.
More to come, but these are some good features to check out for now.
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