Exim is a mail transfer agent (MTA) used on Unix-like operating systems.
# exim -bp
# exim -Mrm {message-id}
# exim -bp | awk '/^ *[0-9]+[mhd]/{print "exim -Mrm " $3}' | bash
Dallas Marlow, suggested following clean command:
# exim -bp | exiqgrep -i | xargs exim -Mrm