test_file msg_02.txt msg_02-1.txt --set-param=X-Mailer:test:set
test_file msg_13.txt msg_13-1.txt -B '*/*'
test_file msg_13.txt msg_13.txt -t 'text/*' -b 'image/*' -B '*/*'
+test_file msg_36.txt msg_36-1.txt -i multipart/alternative
+test_file msg_36.txt msg_36-2.txt -I multipart/alternative
# Test --save-*
test2() {