system
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In your email client you can try changing your User ID to yourname#pop.yourisp.com@127.0.0.1
Also, you may need to change the port numbers for your email client and your spam program. I use SpamPal but the configuration should be similar. My email client incoming port is set for 1110 and my spam program incoming port is set for 111. Avast uses 110 by default.
However, Avast, my email client, and spam program are set for port 25 for outgoing.