Mta queuing messages with razor

Hello, I'm network admin from a university and I have a problem that could be happened before: when I turn on the razor filter, my server start queuing messages and continue queuing until I turn off the filter or the traffic goes down, at night for example.

Some of the messages are delivered (including with the razor tests), but the most of them are queued. I can see in the logs that the tests are working.

I'm using the classic solution:
postfix-2.3-20050726
amavisd-new-2.3.3
spamassassin-3.1.1

and razor-agents-2.81 plugin to spamassassin. All running over a Fedora 4 kernel 2.6 with no high load on the server.

Normally 600 messages stay in the queue, due a lot of reasons. But with the razor filter active, the queue grows to over than 2.000 messages and stop growing just when I deactivate the filter. The server process around 50.000 messages/day.

Any idea to solve this problem? Is there some kind of connections limit to the razor servers? If yes, can I use a something like a local cache of razor?

Regards,

 
Alex de Vargas Barcelos
Administração de Redes
[email protected]
GTIT / PUCRS
 



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