Email Configuring mail filtering

I think this guide is good to setup spam protection to Postfix:
How to Add Antivirus and Spam Protection to Postfix Mail Server with ClamAV and SpamAssassin

 

Centminmod provides no support for email servers and, therefore, no support for SpamAssassin or other email server programs.
Sometimes someone will help or suggest how to run an email server, such as running one on a separate VPS server. Centminmod has a topic on the use of alternative email servers and also on the use of hosted email services.
email servers can be complex to set up, have many options, and can interfere with running a web server/WP server. Unless Eva2000 decides to offer support, it is best to stick what Centminmod does well and run email off of another server or hosted service.

 

Most of the SPAM at our mail server is catched by postscreen and dnsbl (e.g. zen.spamhaus.org, b.barracudacentral.org). You should set up both of them.

This is our working sieve rule for general Junk folder:

Code:

require ["fileinto"];

# rule:[Move Spam to Junk Folder]
if header :is "X-Spam-Flag" "YES"
{
    fileinto "Junk";
}

 

OK, my advice is:
1) Do not try to install an email server on a Centminmod VPS. It is not supported and I doubt that you will find anyone to help you.
2) That is because VPS are cheap so you can have one that runs one of the email servers discussed on other threads on this board. Then you can set up your primary domain server, let's assume that is yourdomain.com using Centminmod so that it aliases to the email server.
Search for the other threads to find more information.
3) If you decide on an email server to use on a separate VPS and then install that, you can use that email server support forum to help set up the use such as using a Wordperfect email app.
Then if you run into issues, such as how to set up the use of the server for WP sites, you should first seek help from the WP app support and, if you have issues that are particular to how Centminmod interfaces with WP, come back here to ask specific questions.
These are just my opinions. If you can find someone who wants to answer otherwise, then go for it.