test_file msg_22.txt msg_22-1.txt -r content-id
test_file msg_29.txt msg_29-1.txt -R Content-Type:title
test_file msg_18.txt msg_18-1.txt --remove-params=X-Foobar-Spoink-Defrobnit
test_file msg_22.txt msg_22-1.txt -r content-id
test_file msg_29.txt msg_29-1.txt -R Content-Type:title
test_file msg_18.txt msg_18-1.txt --remove-params=X-Foobar-Spoink-Defrobnit