Thank GNUtransfer the loan us a VPS and other resources to write this article.
On some servers where it is installed GNUPanel mail traffic is very high and that makes amavis consume many resources, which results in a decline in the quality of service apache, pdns, proftpd, etc.
In this article we will see how to do to run amavis, clamav and spamassassin on a separate server.
Before we start we should clarify that while not mandatory, the most convenient is that the IPs that communicate by postfix (on the main server) and amavis (antispam server) is to be private, either through a separate network or as we have done for example through a VPN, for which we use openvpn with the following howto.
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