Delete Mails on Hold

[yusufu]

I have this application generating unnecessary mails to my Zimbra queue.
So I put the mails from that application on hold.
They keep generating anyway.
Can I delete all these mails that I put on hold at once, I really don't want to use web admin cause it sucks.
All the mails don't show at the same time. I have to delete like 70 at a time and I have already put about 7000 on hold
.
Please gimme a command to delete the whole hold queue.

Also, without running AntiSpam and Antivirus, the active queue is still quite large.
Is there a way to optimize Zimbra so that it sorts the queue better.
Please don't tell me postfix flush.