Exim commands to add remove mails in queue

To remove frozen mails in queue
exim -bpru|grep frozen|awk {'print $3'}|xargs exim -Mrm
or
exiqgrep -zi | xargs exim -Mrm


To remove failed delivery messages to (likely) non-existent senders in queue
exiqgrep -i -f '<>' | xargs exim -Mr