-Never touch multipart/encrypted and multipart/signed (but allow -I).
+GitHub, Travis, AppVeyor, PyPI.
+
+
+Python 3.
+
+
+Process message/delivery-status and text/rfc822-headers subparts.
+
+
+Never decode subparts of multipart/encrypted and multipart/signed messages but
+allow processing of headers of the top-level part, ignoring the top-level part
+with -I, aborting it with -e or saving the part or subparts with --save-*.
Convert dates to the current locale and timezone (with an option?)