qmail filtering

Stop messages being sent according to certain crtieria

[Listening To Music]

Hi.

Can anyone tell me how to filter qmail to stop sending certain messages according to some criteria I set?

At the moment, my server sends a daily e-mail to each of my clients (it's a Plesk related e-mail). It's annoying and noone wants it. Since I have no idea how to stop Plesk from sending this mail, I've decided to filter it and make it drop the mail entirely.

I'd want it to filter the:
- Subject: "<abc.def.ghi.secureserver.net> Report on client xyz123". If it says "Report on client", that's the first criteria satisfied.
- The body: If it contains certain keywords or phrases such as "Version", "Client Status", "Active domains", "Disk space used by Domains", etc. Any number of keywords that I decide to use basically.

How can I get qmail to just drop them?
This is kind of urgent, so if anyone can help, I'd appreciate it!

Thanks! :)