1 Add option -I to completely skip (remove) subparts -- no headers, no body,
5 Never touch multipart/encrypted and multipart/signed (but allow -I).
8 Convert dates to the current locale and timezone (with an option?)
11 Allow -d and -p accept shell-like patterns and/or regular expressions:
12 -d content-*,-content-*-encoding
15 Add option --save-as='%format' to generate names for --save-* files. Develop
16 a DSL to conditionally use values of headers, parameters and the counter.