How to uninstall Spam assassin and Drweb

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hi,

We are using RHEL3 with Plexk 8.0.1.

We see that our qmil automatically stops at times.
We would like to uninstall Spamassassin and Drweb.

Any idea how we can do this without affecting the email queue?

Awaiting help.

Thx
Parag.