squirrelmail and qmail-scanner problem

[astano]

I'm using qmail-scanner 1.16 and squirrelmail 1.4.3.a. When I send any e-mail using outlook or kmail it get checked by qmail-scanner for virus and spam (yes, it´s configured to scan e-mail sent by my domain). The problem: when I send email using squirrelmail it isn´t check.

Anyone knows how to make squirrelmail send email via qmail-scanner?

Thanks in advance, and sorrry for my english....
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Ast@nO