How can I purge the queue

[Claudiu Balciza]

(qmail 1.03/RedHat5.2/kernel 2.2.5)

Hi,

Whenever I tweak with my firewall rules, qmail fails to deliver messages
(that's ok).
I can see them on the queue.
But when it retries to send those certain deffered messages it fails again.
I tried sending a new message with the exact to/from/subject/content and it
left in no time while the old one still stays in the queue.
I even forced the delivery by hand (to no avail)

How can I purge the queue ?

Claudiu