We have alot of issues with people using open contact forms on their websites causing spammers to fill up the exim mail queues on webservers. Today I found a great set of commands to fix the issue.
exim -bp will show the current queue
exiqgrep -ir spam@example.com | xargs exim -Mrm will query the entire queue for all IDs of one specific address and pipe that to be removed via exim -Mrm