Possible e-mail/AV software conflict

It seems that I have an intermittent conflict between Eudora 7.1.0.9 and my internet security package, Trend Micro's PC-cillin Internet Security 2007. I'd like to know whether there are any setting or configuration changes that I can make that will reduce or eliminate that conflict.

It does not happen often -- maybe every month or so -- but I'd prefer it didn't happen at all. When it does happen, I can still send mail, but any attempt to check mail results in the error message Error reading from network. Cause: connection closed by foreign host. (0) The progress bar does appear, but no progress is indicated. For a short interval after the error message appears, TM PC-cillin continues to display it's "inspecting incoming e-mail" flag.

Nothing has presented itself as a possible trigger for this behaviour. It just happens without warning.

I see it as a conflict between Eudora and TM PC-cillin because the only way I have found to clear the conflict is to shut down TM PC-cillin entirely, download any incoming e-mail that is on my POP server, then restart my system. Disabling TM PC-cillin does not suffice.

The last time it happened, the incoming e-mail was all from known reliable sources whose communications were expected. Nevertheless, I deleted the first three messages in the POP server queue, as well as all e-mail that included attachments that had a potential for a hostile payload, and tried again. This did not clear the problem.

Needless to say, I am not happy about downloading e-mail without active anti-virus protection in place.