Remove messages from mail queue by recipient

postsuper-delete-recipient.sh

# Adapted from `man postsuper` (in earlier tail versions, one could write the shortcut `tail +2` to skip the first line)
mailq | tail -n +2 | grep -v '^ *(' | awk  'BEGIN { RS = "" }
                  # $7=sender, $8=recipient1, $9=recipient2
                  { if ($8 == "someone@example.com" && $9 == "")
                        print $1 }
              ' | tr -d '*!' | postsuper -d -