Problem with sqwebmail + qmail-scanner

[davi]

I have noticed that it is possible to send infected messages
with sqwebmail running qmail-scanner.
I guess sqwebmail put messages directly in the queue, so it
no qmail-smptd is called and no antivirus is used.

The only solution I could find is reverting to Amavis.
Amavis is bit harder to setup and maintain, and I always
prefered qmail-scanner, even being a lot slower and more resource
consuming. Now Amavis is the only option.

Some ideia?