qmail attack

I was the recipient of an attack just yesterday. 22000+ emails popped into the qmail queue and severely impacted on functionality.

ps -ax | grep qmail
tail -f /var/log/messages
tail -f /var/log/syslog

I tried to use the Plesk GUI to look at the mail queue and remove the mails - but it just timed out. So, I downloaded qmhandle and used it to remove the queued messages.