What to do if Spamassassin is filtering slower than Postfix is receiving the email?

Problem

Frank has a problem on one of his SPAM servers that uses Postfix and Spamassassin. Spamassassin is filtering slower than Postfix is receiving the email. So the Postfix queue grows larger and larger. He been trying to speed up Spamassassin, but he cannot make it fast enough.

Solution

If Frank were to install Traffic Control in front of his Postfix, then it could slow down bad senders and speed up good senders. Since most bad senders simply give up when they faced with throttling, the overall number of messages being received by Postfix and Spamassasin would be greatly decreased, lowering the load and preventing the Postfix queue from growing.

Download a free version of Traffic Control and see how throttling unknown senders and multiplexing to your mail server can relieve your sysadmin headaches.